MozartV1, PascalFrancis, Corpus, bibRecord, 000161

Comparison of 7 years of satellite-borne and ground-based tropospheric NO2 measurements around Milan, Italy

Identifieur interne : 000161 ( PascalFrancis/Corpus ); précédent : 000160; suivant : 000162

Comparison of 7 years of satellite-borne and ground-based tropospheric NO2 measurements around Milan, Italy

Auteurs : C. Ordonez ; A. Richter ; M. Steinbacher ; C. Zellweger ; H. Nüss ; J. P. Burrows ; A. S. H. Prevot

Source :

Journal of geophysical research [ 0148-0227 ] ; 2006.

RBID : Pascal:06-0232377

Descripteurs français

Pascal (Inist)
- Satellite, Troposphère, Densité colonne, Monde, Ozone, Surveillance, Etude expérimentale, Absorption optique, Mesure in situ, Nuage, Versant, Automne, Hiver, Source, Printemps, Eté, Peracétique acide nitrate, Nitrique acide, Modèle, Traceur, Coefficient corrélation, Variation spatiale, Pollution, Cycle, Aérosol, Milan.

English descriptors

KwdEn :
- Autumn, Column density, Measurement in situ, Milan Italy, Nitric acid, Optical absorption, Peroxyacetyl nitrate, Spring(season), Summer, Winter, aerosols, clouds, correlation coefficient, cycles, experimental studies, global, models, monitoring, ozone, pollution, satellites, slopes, spatial variations, springs, tracers, troposphere.

Abstract

Tropospheric NO₂ vertical column densities (VCDs) over the Lombardy region were retrieved from measurements of the Global Ozone Monitoring Experiment (GOME) spectrometer for the period 1996-2002 using a differential optical absorption method. This data set was compared with in situ measurements of NO₂ at around 100 ground stations in the Lombardy region, northern Italy. The tropospheric NO₂ VCDs are reasonably well correlated with the near-surface measurements under cloud-free conditions. However, the slope of the tropospheric VCDs versus ground measurements is higher in autumn-winter than in spring-summer. This effect is clearly reduced when the peroxyacetyl nitrate and nitric acid (HNO₃) interferences of conventional NO_xanalyzers are taken into account. For a more quantitative comparison, the NO₂ground measurements were scaled to tropospheric VCDs using a seasonal NO₂ vertical profile over northern Italy calculated by the Model of Ozone and Related Tracers 2 (MOZART-2). The tropospheric VCDs retrieved from satellite and those determined from ground measurements agree well, with a correlation coefficient R = 0.78 and a slope close to 1 for slightly polluted stations. GOME cannot reproduce the high NO₂ amounts over the most polluted stations, mainly because of the large spatial variability in the distribution of pollution within the GOME footprint. The yearly and weekly cycles of the tropospheric NO₂ VCDs are similar for both data sets, with significantly lower values in the summer months and on Sundays, respectively. Considering the pollution level and high aerosol concentrations of this region, the agreement is very good. Furthermore, uncertainties in the ground-based measurements, including the extrapolation to NO₂ VCDs, might be as important as those of the NO₂ satellite retrieval itself.

Notice en format standard (ISO 2709)

Pour connaître la documentation sur le format Inist Standard.

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Format Inist (serveur)

NO :	PASCAL 06-0232377 INIST
ET :	Comparison of 7 years of satellite-borne and ground-based tropospheric NO₂ measurements around Milan, Italy
AU :	ORDONEZ (C.); RICHTER (A.); STEINBACHER (M.); ZELLWEGER (C.); NÜSS (H.); BURROWS (J. P.); PREVOT (A. S. H.)
AF :	Laboratory of Atmospheric Chemistry, Paul Scherrer Institut/Villigen/Suisse (1 aut., 7 aut.); Institute of Environmental Physics, University of Bremen/Bremen/Allemagne (2 aut., 5 aut., 6 aut.); Swiss Federal Institute for Materials Science and Technology/Dubendorf/Suisse (3 aut., 4 aut.)
DT :	Publication en série; Niveau analytique
SO :	Journal of geophysical research; ISSN 0148-0227; Etats-Unis; Da. 2006; Vol. 111; No. D5; D05310.1-D05310.12; Bibl. 1 p.1/4
LA :	Anglais
EA :	Tropospheric NO₂ vertical column densities (VCDs) over the Lombardy region were retrieved from measurements of the Global Ozone Monitoring Experiment (GOME) spectrometer for the period 1996-2002 using a differential optical absorption method. This data set was compared with in situ measurements of NO₂ at around 100 ground stations in the Lombardy region, northern Italy. The tropospheric NO₂ VCDs are reasonably well correlated with the near-surface measurements under cloud-free conditions. However, the slope of the tropospheric VCDs versus ground measurements is higher in autumn-winter than in spring-summer. This effect is clearly reduced when the peroxyacetyl nitrate and nitric acid (HNO₃) interferences of conventional NO_xanalyzers are taken into account. For a more quantitative comparison, the NO₂ground measurements were scaled to tropospheric VCDs using a seasonal NO₂ vertical profile over northern Italy calculated by the Model of Ozone and Related Tracers 2 (MOZART-2). The tropospheric VCDs retrieved from satellite and those determined from ground measurements agree well, with a correlation coefficient R = 0.78 and a slope close to 1 for slightly polluted stations. GOME cannot reproduce the high NO₂ amounts over the most polluted stations, mainly because of the large spatial variability in the distribution of pollution within the GOME footprint. The yearly and weekly cycles of the tropospheric NO₂ VCDs are similar for both data sets, with significantly lower values in the summer months and on Sundays, respectively. Considering the pollution level and high aerosol concentrations of this region, the agreement is very good. Furthermore, uncertainties in the ground-based measurements, including the extrapolation to NO₂ VCDs, might be as important as those of the NO₂ satellite retrieval itself.
CC :	220; 001E; 001E01
FD :	Satellite; Troposphère; Densité colonne; Monde; Ozone; Surveillance; Etude expérimentale; Absorption optique; Mesure in situ; Nuage; Versant; Automne; Hiver; Source; Printemps; Eté; Peracétique acide nitrate; Nitrique acide; Modèle; Traceur; Coefficient corrélation; Variation spatiale; Pollution; Cycle; Aérosol; Milan
FG :	Lombardie; Italie; Europe Sud; Europe
ED :	satellites; troposphere; Column density; global; ozone; monitoring; experimental studies; Optical absorption; Measurement in situ; clouds; slopes; Autumn; Winter; springs; Spring(season); Summer; Peroxyacetyl nitrate; Nitric acid; models; tracers; correlation coefficient; spatial variations; pollution; cycles; aerosols; Milan Italy
EG :	Lombardy Italy; Italy; Southern Europe; Europe
SD :	Satélite; Densidad columna; Mundo; Ozono; Vigilancia; Absorción óptica; Medición en sitio; Nube; Declive; Otoño; Invierno; Fuente; Primavera; Verano; Nítrico ácido; Modelo; Trazador; Coeficiente correlación; Variación espacial; Polución; Aerosol
LO :	INIST-3144.354000156802760390
ID :	06-0232377

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Pascal:06-0232377

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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Autumn</term>
<term>Column density</term>
<term>Measurement in situ</term>
<term>Milan Italy</term>
<term>Nitric acid</term>
<term>Optical absorption</term>
<term>Peroxyacetyl nitrate</term>
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<term>Summer</term>
<term>Winter</term>
<term>aerosols</term>
<term>clouds</term>
<term>correlation coefficient</term>
<term>cycles</term>
<term>experimental studies</term>
<term>global</term>
<term>models</term>
<term>monitoring</term>
<term>ozone</term>
<term>pollution</term>
<term>satellites</term>
<term>slopes</term>
<term>spatial variations</term>
<term>springs</term>
<term>tracers</term>
<term>troposphere</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Satellite</term>
<term>Troposphère</term>
<term>Densité colonne</term>
<term>Monde</term>
<term>Ozone</term>
<term>Surveillance</term>
<term>Etude expérimentale</term>
<term>Absorption optique</term>
<term>Mesure in situ</term>
<term>Nuage</term>
<term>Versant</term>
<term>Automne</term>
<term>Hiver</term>
<term>Source</term>
<term>Printemps</term>
<term>Eté</term>
<term>Peracétique acide nitrate</term>
<term>Nitrique acide</term>
<term>Modèle</term>
<term>Traceur</term>
<term>Coefficient corrélation</term>
<term>Variation spatiale</term>
<term>Pollution</term>
<term>Cycle</term>
<term>Aérosol</term>
<term>Milan</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">Tropospheric NO<sub>2</sub>
 vertical column densities (VCDs) over the Lombardy region were retrieved from measurements of the Global Ozone Monitoring Experiment (GOME) spectrometer for the period 1996-2002 using a differential optical absorption method. This data set was compared with in situ measurements of NO<sub>2</sub>
 at around 100 ground stations in the Lombardy region, northern Italy. The tropospheric NO<sub>2</sub>
 VCDs are reasonably well correlated with the near-surface measurements under cloud-free conditions. However, the slope of the tropospheric VCDs versus ground measurements is higher in autumn-winter than in spring-summer. This effect is clearly reduced when the peroxyacetyl nitrate and nitric acid (HNO<sub>3</sub>
) interferences of conventional NO<sub>x</sub>
analyzers are taken into account. For a more quantitative comparison, the NO<sub>2</sub>
ground measurements were scaled to tropospheric VCDs using a seasonal NO<sub>2</sub>
 vertical profile over northern Italy calculated by the Model of Ozone and Related Tracers 2 (MOZART-2). The tropospheric VCDs retrieved from satellite and those determined from ground measurements agree well, with a correlation coefficient R = 0.78 and a slope close to 1 for slightly polluted stations. GOME cannot reproduce the high NO<sub>2</sub>
 amounts over the most polluted stations, mainly because of the large spatial variability in the distribution of pollution within the GOME footprint. The yearly and weekly cycles of the tropospheric NO<sub>2</sub>
 VCDs are similar for both data sets, with significantly lower values in the summer months and on Sundays, respectively. Considering the pollution level and high aerosol concentrations of this region, the agreement is very good. Furthermore, uncertainties in the ground-based measurements, including the extrapolation to NO<sub>2</sub>
 VCDs, might be as important as those of the NO<sub>2</sub>
 satellite retrieval itself.</div>
</front>
</TEI>
<inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0148-0227</s0>
</fA01>
<fA03 i2="1"><s0>J. geophys. res.</s0>
</fA03>
<fA05><s2>111</s2>
</fA05>
<fA06><s2>D5</s2>
</fA06>
<fA08 i1="01" i2="1" l="ENG"><s1>Comparison of 7 years of satellite-borne and ground-based tropospheric NO<sub>2</sub>
 measurements around Milan, Italy</s1>
</fA08>
<fA11 i1="01" i2="1"><s1>ORDONEZ (C.)</s1>
</fA11>
<fA11 i1="02" i2="1"><s1>RICHTER (A.)</s1>
</fA11>
<fA11 i1="03" i2="1"><s1>STEINBACHER (M.)</s1>
</fA11>
<fA11 i1="04" i2="1"><s1>ZELLWEGER (C.)</s1>
</fA11>
<fA11 i1="05" i2="1"><s1>NÜSS (H.)</s1>
</fA11>
<fA11 i1="06" i2="1"><s1>BURROWS (J. P.)</s1>
</fA11>
<fA11 i1="07" i2="1"><s1>PREVOT (A. S. H.)</s1>
</fA11>
<fA14 i1="01"><s1>Laboratory of Atmospheric Chemistry, Paul Scherrer Institut</s1>
<s2>Villigen</s2>
<s3>CHE</s3>
<sZ>1 aut.</sZ>
<sZ>7 aut.</sZ>
</fA14>
<fA14 i1="02"><s1>Institute of Environmental Physics, University of Bremen</s1>
<s2>Bremen</s2>
<s3>DEU</s3>
<sZ>2 aut.</sZ>
<sZ>5 aut.</sZ>
<sZ>6 aut.</sZ>
</fA14>
<fA14 i1="03"><s1>Swiss Federal Institute for Materials Science and Technology</s1>
<s2>Dubendorf</s2>
<s3>CHE</s3>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
</fA14>
<fA20><s2>D05310.1-D05310.12</s2>
</fA20>
<fA21><s1>2006</s1>
</fA21>
<fA23 i1="01"><s0>ENG</s0>
</fA23>
<fA43 i1="01"><s1>INIST</s1>
<s2>3144</s2>
<s5>354000156802760390</s5>
</fA43>
<fA44><s0>0000</s0>
<s1>© 2006 INIST-CNRS. All rights reserved.</s1>
</fA44>
<fA45><s0>1 p.1/4</s0>
</fA45>
<fA47 i1="01" i2="1"><s0>06-0232377</s0>
</fA47>
<fA60><s1>P</s1>
</fA60>
<fA61><s0>A</s0>
</fA61>
<fA64 i1="01" i2="1"><s0>Journal of geophysical research</s0>
</fA64>
<fA66 i1="01"><s0>USA</s0>
</fA66>
<fC01 i1="01" l="ENG"><s0>Tropospheric NO<sub>2</sub>
 vertical column densities (VCDs) over the Lombardy region were retrieved from measurements of the Global Ozone Monitoring Experiment (GOME) spectrometer for the period 1996-2002 using a differential optical absorption method. This data set was compared with in situ measurements of NO<sub>2</sub>
 at around 100 ground stations in the Lombardy region, northern Italy. The tropospheric NO<sub>2</sub>
 VCDs are reasonably well correlated with the near-surface measurements under cloud-free conditions. However, the slope of the tropospheric VCDs versus ground measurements is higher in autumn-winter than in spring-summer. This effect is clearly reduced when the peroxyacetyl nitrate and nitric acid (HNO<sub>3</sub>
) interferences of conventional NO<sub>x</sub>
analyzers are taken into account. For a more quantitative comparison, the NO<sub>2</sub>
ground measurements were scaled to tropospheric VCDs using a seasonal NO<sub>2</sub>
 vertical profile over northern Italy calculated by the Model of Ozone and Related Tracers 2 (MOZART-2). The tropospheric VCDs retrieved from satellite and those determined from ground measurements agree well, with a correlation coefficient R = 0.78 and a slope close to 1 for slightly polluted stations. GOME cannot reproduce the high NO<sub>2</sub>
 amounts over the most polluted stations, mainly because of the large spatial variability in the distribution of pollution within the GOME footprint. The yearly and weekly cycles of the tropospheric NO<sub>2</sub>
 VCDs are similar for both data sets, with significantly lower values in the summer months and on Sundays, respectively. Considering the pollution level and high aerosol concentrations of this region, the agreement is very good. Furthermore, uncertainties in the ground-based measurements, including the extrapolation to NO<sub>2</sub>
 VCDs, might be as important as those of the NO<sub>2</sub>
 satellite retrieval itself.</s0>
</fC01>
<fC02 i1="01" i2="2"><s0>220</s0>
</fC02>
<fC02 i1="02" i2="3"><s0>001E</s0>
</fC02>
<fC02 i1="03" i2="2"><s0>001E01</s0>
</fC02>
<fC03 i1="01" i2="2" l="FRE"><s0>Satellite</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="2" l="ENG"><s0>satellites</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="2" l="SPA"><s0>Satélite</s0>
<s5>01</s5>
</fC03>
<fC03 i1="02" i2="2" l="FRE"><s0>Troposphère</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="2" l="ENG"><s0>troposphere</s0>
<s5>02</s5>
</fC03>
<fC03 i1="03" i2="X" l="FRE"><s0>Densité colonne</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="ENG"><s0>Column density</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="SPA"><s0>Densidad columna</s0>
<s5>03</s5>
</fC03>
<fC03 i1="04" i2="2" l="FRE"><s0>Monde</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="2" l="ENG"><s0>global</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="2" l="SPA"><s0>Mundo</s0>
<s5>04</s5>
</fC03>
<fC03 i1="05" i2="2" l="FRE"><s0>Ozone</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="2" l="ENG"><s0>ozone</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="2" l="SPA"><s0>Ozono</s0>
<s5>05</s5>
</fC03>
<fC03 i1="06" i2="2" l="FRE"><s0>Surveillance</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="2" l="ENG"><s0>monitoring</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="2" l="SPA"><s0>Vigilancia</s0>
<s5>06</s5>
</fC03>
<fC03 i1="07" i2="2" l="FRE"><s0>Etude expérimentale</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="2" l="ENG"><s0>experimental studies</s0>
<s5>07</s5>
</fC03>
<fC03 i1="08" i2="X" l="FRE"><s0>Absorption optique</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="ENG"><s0>Optical absorption</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="SPA"><s0>Absorción óptica</s0>
<s5>08</s5>
</fC03>
<fC03 i1="09" i2="X" l="FRE"><s0>Mesure in situ</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="X" l="ENG"><s0>Measurement in situ</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="X" l="SPA"><s0>Medición en sitio</s0>
<s5>09</s5>
</fC03>
<fC03 i1="10" i2="2" l="FRE"><s0>Nuage</s0>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="2" l="ENG"><s0>clouds</s0>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="2" l="SPA"><s0>Nube</s0>
<s5>10</s5>
</fC03>
<fC03 i1="11" i2="2" l="FRE"><s0>Versant</s0>
<s5>11</s5>
</fC03>
<fC03 i1="11" i2="2" l="ENG"><s0>slopes</s0>
<s5>11</s5>
</fC03>
<fC03 i1="11" i2="2" l="SPA"><s0>Declive</s0>
<s5>11</s5>
</fC03>
<fC03 i1="12" i2="X" l="FRE"><s0>Automne</s0>
<s5>12</s5>
</fC03>
<fC03 i1="12" i2="X" l="ENG"><s0>Autumn</s0>
<s5>12</s5>
</fC03>
<fC03 i1="12" i2="X" l="SPA"><s0>Otoño</s0>
<s5>12</s5>
</fC03>
<fC03 i1="13" i2="X" l="FRE"><s0>Hiver</s0>
<s5>13</s5>
</fC03>
<fC03 i1="13" i2="X" l="ENG"><s0>Winter</s0>
<s5>13</s5>
</fC03>
<fC03 i1="13" i2="X" l="SPA"><s0>Invierno</s0>
<s5>13</s5>
</fC03>
<fC03 i1="14" i2="2" l="FRE"><s0>Source</s0>
<s5>14</s5>
</fC03>
<fC03 i1="14" i2="2" l="ENG"><s0>springs</s0>
<s5>14</s5>
</fC03>
<fC03 i1="14" i2="2" l="SPA"><s0>Fuente</s0>
<s5>14</s5>
</fC03>
<fC03 i1="15" i2="X" l="FRE"><s0>Printemps</s0>
<s5>15</s5>
</fC03>
<fC03 i1="15" i2="X" l="ENG"><s0>Spring(season)</s0>
<s5>15</s5>
</fC03>
<fC03 i1="15" i2="X" l="SPA"><s0>Primavera</s0>
<s5>15</s5>
</fC03>
<fC03 i1="16" i2="X" l="FRE"><s0>Eté</s0>
<s5>16</s5>
</fC03>
<fC03 i1="16" i2="X" l="ENG"><s0>Summer</s0>
<s5>16</s5>
</fC03>
<fC03 i1="16" i2="X" l="SPA"><s0>Verano</s0>
<s5>16</s5>
</fC03>
<fC03 i1="17" i2="3" l="FRE"><s0>Peracétique acide nitrate</s0>
<s2>NK</s2>
<s5>17</s5>
</fC03>
<fC03 i1="17" i2="3" l="ENG"><s0>Peroxyacetyl nitrate</s0>
<s2>NK</s2>
<s5>17</s5>
</fC03>
<fC03 i1="18" i2="X" l="FRE"><s0>Nitrique acide</s0>
<s2>NK</s2>
<s5>18</s5>
</fC03>
<fC03 i1="18" i2="X" l="ENG"><s0>Nitric acid</s0>
<s2>NK</s2>
<s5>18</s5>
</fC03>
<fC03 i1="18" i2="X" l="SPA"><s0>Nítrico ácido</s0>
<s2>NK</s2>
<s5>18</s5>
</fC03>
<fC03 i1="19" i2="2" l="FRE"><s0>Modèle</s0>
<s5>19</s5>
</fC03>
<fC03 i1="19" i2="2" l="ENG"><s0>models</s0>
<s5>19</s5>
</fC03>
<fC03 i1="19" i2="2" l="SPA"><s0>Modelo</s0>
<s5>19</s5>
</fC03>
<fC03 i1="20" i2="2" l="FRE"><s0>Traceur</s0>
<s5>20</s5>
</fC03>
<fC03 i1="20" i2="2" l="ENG"><s0>tracers</s0>
<s5>20</s5>
</fC03>
<fC03 i1="20" i2="2" l="SPA"><s0>Trazador</s0>
<s5>20</s5>
</fC03>
<fC03 i1="21" i2="2" l="FRE"><s0>Coefficient corrélation</s0>
<s5>21</s5>
</fC03>
<fC03 i1="21" i2="2" l="ENG"><s0>correlation coefficient</s0>
<s5>21</s5>
</fC03>
<fC03 i1="21" i2="2" l="SPA"><s0>Coeficiente correlación</s0>
<s5>21</s5>
</fC03>
<fC03 i1="22" i2="2" l="FRE"><s0>Variation spatiale</s0>
<s5>22</s5>
</fC03>
<fC03 i1="22" i2="2" l="ENG"><s0>spatial variations</s0>
<s5>22</s5>
</fC03>
<fC03 i1="22" i2="2" l="SPA"><s0>Variación espacial</s0>
<s5>22</s5>
</fC03>
<fC03 i1="23" i2="2" l="FRE"><s0>Pollution</s0>
<s5>23</s5>
</fC03>
<fC03 i1="23" i2="2" l="ENG"><s0>pollution</s0>
<s5>23</s5>
</fC03>
<fC03 i1="23" i2="2" l="SPA"><s0>Polución</s0>
<s5>23</s5>
</fC03>
<fC03 i1="24" i2="2" l="FRE"><s0>Cycle</s0>
<s5>24</s5>
</fC03>
<fC03 i1="24" i2="2" l="ENG"><s0>cycles</s0>
<s5>24</s5>
</fC03>
<fC03 i1="25" i2="2" l="FRE"><s0>Aérosol</s0>
<s5>25</s5>
</fC03>
<fC03 i1="25" i2="2" l="ENG"><s0>aerosols</s0>
<s5>25</s5>
</fC03>
<fC03 i1="25" i2="2" l="SPA"><s0>Aerosol</s0>
<s5>25</s5>
</fC03>
<fC03 i1="26" i2="2" l="FRE"><s0>Milan</s0>
<s2>NG</s2>
<s5>61</s5>
</fC03>
<fC03 i1="26" i2="2" l="ENG"><s0>Milan Italy</s0>
<s2>NG</s2>
<s5>61</s5>
</fC03>
<fC07 i1="01" i2="2" l="FRE"><s0>Lombardie</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="01" i2="2" l="ENG"><s0>Lombardy Italy</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="01" i2="2" l="SPA"><s0>Lombardía</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="02" i2="2" l="FRE"><s0>Italie</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="02" i2="2" l="ENG"><s0>Italy</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="02" i2="2" l="SPA"><s0>Italia</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="03" i2="2" l="FRE"><s0>Europe Sud</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="03" i2="2" l="ENG"><s0>Southern Europe</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="03" i2="2" l="SPA"><s0>Europa Sur</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="04" i2="2" l="FRE"><s0>Europe</s0>
</fC07>
<fC07 i1="04" i2="2" l="ENG"><s0>Europe</s0>
</fC07>
<fC07 i1="04" i2="2" l="SPA"><s0>Europa</s0>
</fC07>
<fN21><s1>142</s1>
</fN21>
<fN44 i1="01"><s1>OTO</s1>
</fN44>
<fN82><s1>OTO</s1>
</fN82>
</pA>
</standard>
<server><NO>PASCAL 06-0232377 INIST</NO>
<ET>Comparison of 7 years of satellite-borne and ground-based tropospheric NO<sub>2</sub>
 measurements around Milan, Italy</ET>
<AU>ORDONEZ (C.); RICHTER (A.); STEINBACHER (M.); ZELLWEGER (C.); NÜSS (H.); BURROWS (J. P.); PREVOT (A. S. H.)</AU>
<AF>Laboratory of Atmospheric Chemistry, Paul Scherrer Institut/Villigen/Suisse (1 aut., 7 aut.); Institute of Environmental Physics, University of Bremen/Bremen/Allemagne (2 aut., 5 aut., 6 aut.); Swiss Federal Institute for Materials Science and Technology/Dubendorf/Suisse (3 aut., 4 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Journal of geophysical research; ISSN 0148-0227; Etats-Unis; Da. 2006; Vol. 111; No. D5; D05310.1-D05310.12; Bibl. 1 p.1/4</SO>
<LA>Anglais</LA>
<EA>Tropospheric NO<sub>2</sub>
 vertical column densities (VCDs) over the Lombardy region were retrieved from measurements of the Global Ozone Monitoring Experiment (GOME) spectrometer for the period 1996-2002 using a differential optical absorption method. This data set was compared with in situ measurements of NO<sub>2</sub>
 at around 100 ground stations in the Lombardy region, northern Italy. The tropospheric NO<sub>2</sub>
 VCDs are reasonably well correlated with the near-surface measurements under cloud-free conditions. However, the slope of the tropospheric VCDs versus ground measurements is higher in autumn-winter than in spring-summer. This effect is clearly reduced when the peroxyacetyl nitrate and nitric acid (HNO<sub>3</sub>
) interferences of conventional NO<sub>x</sub>
analyzers are taken into account. For a more quantitative comparison, the NO<sub>2</sub>
ground measurements were scaled to tropospheric VCDs using a seasonal NO<sub>2</sub>
 vertical profile over northern Italy calculated by the Model of Ozone and Related Tracers 2 (MOZART-2). The tropospheric VCDs retrieved from satellite and those determined from ground measurements agree well, with a correlation coefficient R = 0.78 and a slope close to 1 for slightly polluted stations. GOME cannot reproduce the high NO<sub>2</sub>
 amounts over the most polluted stations, mainly because of the large spatial variability in the distribution of pollution within the GOME footprint. The yearly and weekly cycles of the tropospheric NO<sub>2</sub>
 VCDs are similar for both data sets, with significantly lower values in the summer months and on Sundays, respectively. Considering the pollution level and high aerosol concentrations of this region, the agreement is very good. Furthermore, uncertainties in the ground-based measurements, including the extrapolation to NO<sub>2</sub>
 VCDs, might be as important as those of the NO<sub>2</sub>
 satellite retrieval itself.</EA>
<CC>220; 001E; 001E01</CC>
<FD>Satellite; Troposphère; Densité colonne; Monde; Ozone; Surveillance; Etude expérimentale; Absorption optique; Mesure in situ; Nuage; Versant; Automne; Hiver; Source; Printemps; Eté; Peracétique acide nitrate; Nitrique acide; Modèle; Traceur; Coefficient corrélation; Variation spatiale; Pollution; Cycle; Aérosol; Milan</FD>
<FG>Lombardie; Italie; Europe Sud; Europe</FG>
<ED>satellites; troposphere; Column density; global; ozone; monitoring; experimental studies; Optical absorption; Measurement in situ; clouds; slopes; Autumn; Winter; springs; Spring(season); Summer; Peroxyacetyl nitrate; Nitric acid; models; tracers; correlation coefficient; spatial variations; pollution; cycles; aerosols; Milan Italy</ED>
<EG>Lombardy Italy; Italy; Southern Europe; Europe</EG>
<SD>Satélite; Densidad columna; Mundo; Ozono; Vigilancia; Absorción óptica; Medición en sitio; Nube; Declive; Otoño; Invierno; Fuente; Primavera; Verano; Nítrico ácido; Modelo; Trazador; Coeficiente correlación; Variación espacial; Polución; Aerosol</SD>
<LO>INIST-3144.354000156802760390</LO>
<ID>06-0232377</ID>
</server>
</inist>
</record>

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   |wiki=    Wicri/Musique
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   |clé=     Pascal:06-0232377
   |texte=   Comparison of 7 years of satellite-borne and ground-based tropospheric NO2 measurements around Milan, Italy
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Comparison of 7 years of satellite-borne and ground-based tropospheric NO2 measurements around Milan, Italy

Comparison of 7 years of satellite-borne and ground-based tropospheric NO2 measurements around Milan, Italy

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