download pdf - Institut für Umweltphysik - Ruprecht-Karls-Universität ...

More documents

Recommendations

Info

78 CHAPTER 2. ATMOSPHERE AND REMOTE SENSING 2.5.7 Satellite validation using the airborne multi axis DOAS instrument Participating scientists Klaus-Peter Heue, Thomas Wagner, Andreas Richter 2 , Marco Bruns 2 Ping Wang 2 ( 2 Institut für Umweltphyisk, Universität Bremen) Abstract The Airborne Multi AXis DOAS instrument designed to separate the tropospheric from stratospheric absorptions of several Trace gases e.g. NO2. Due to the long range of the aeroplane it is ideal for validation measurements of tropospheric NO2 observed by the new satellite instrument SCIAMACHY on ENVISAT. Figure 2.41: AMAXDOAS measurements along the flight track on 19/02/2003 overlaid to SCIA- MACHY observations from the same day. The scientific SCIAMACHY data from the IUP in Bremen were taken. Background With the SCIAMACHY instruments slant and vertical columns of many trace gases can be measured. Here we concentrate on tropospheric NO2. Based on the observed spectra from SCIAMACHY several scientific DOAS products exist at different scientific groups (e.g. in Heidelberg, Bremen, Harvard). Nitrogen dioxide is known to be harmful and plays an important role in the tropospheric chemistry of ozone. Most of the tropospheric NO2 is produced by anthropogenic emissions. Funding See satellite group overview. Methods and results Tropospheric NO2 vertical and slant columns from the new satellite instrument SCIAMACHY on ENVISAT are validated by measurements of the AMAXDOAS instrument on board the DLR Falcon. The results presented here were obtained in February 2003 on a flight over the Alps, the Po-Valley and the Mediterranean ( figure 2.41). Due to the similar measurement system of AMAXDOAS and SCIAMACHY both tropospheric slant and vertical columns can be compared. However, the stratospheric absorption has to be separated from the tropospheric signal first. In the Troposphere the local variation in the NO2 columns are very high caused by the anthropogenic emissions. The stratospheric signal shows rather smooth spatial variations. Different methods for the separation of tropospheric and stratospheric signal for both instruments were investigated. Independent information about aerosol optical thickness and mixing layer height were considered for the calculation of the AMF. The TVCD measured by AMAXDOAS varied between 16.2 and 35.2·10 15 molec/cm 2 over the Po-Valley where SCIAMACHY data resulted in 19.9 to 37·10 15 molec/cm 2 . Over less polluted areas a similarly good agreement was found. The linear correlation between the two datasets results in a slope of 0.93. The slight differences observed can be attributed to the different spatial resolution and the temporal mismatch between the measurements over the Po-Valley. Main publications Heue [2005], Heue et al. [2005]
2.5. SATELLITE GROUP 79 2.5.8 Analysis of global long-term tropospheric and stratospheric BrO from GOME measurements Participating scientist Jens Hollwedel, Thomas Wagner, Roland von Glasow, Lars Kaleschke 2 , William Simpson 3 , Ulrich Platt ( 2 University of Bremen, 3 University of Alaska) Abstract BrO leads to ozone depletion, both in the stratosphere and troposphere. The global distribution and yearly cycle of stratospheric and tropospheric BrO has been analysed. Transport events and an increase in tropospheric source strength have been discussed. Figure 2.42: Global mean BrO distribution derived from GOME for the time period 1996 - 2001. Background The importance of BrO for the ozone depletion in the stratosphere is well known. BrO can also be liberated by heterogenous reactions on the surfaces of halogen rich aerosols, especially over the one year old sea ice. This mechanism is known as the Bromine explosion leading to the tropospheric ozone hole in polar spring. Funding See satellite group overview. Methods and results Column densities of bromine monoxide have been derived from GOME for the time period from 1996 to 2001 on a global scale. Two methods for the separation of the stratospheric and tropospheric fractions of the total column density have been used (a fixed SZA interval and a reference site method). The average stratospheric BrO load has increased slightly during the time period under investigation. Investigation of sources and source strengths of boundary layer BrO show that enhanced boundary layer BrO is released in bromine explosion events during polar spring leading to tropospheric ozone holes. The sea-ice and especially frost flowers are the sources for these events. The area covered by ’clouds’ of enhanced BrO in the northern hemisphere has increased by about 10% per year from 1996 to 2001. Thus the source strength has increased which is probably due to changes in the Arctic sea-ice cover. Strong evidence for a free tropospheric BrO background of about 2pptv BrO in the free troposphere with a lower boundary of its lifetime of about four days has been gathered. Transport events of polar tropospheric Bro towards mid-latitudes and into the free troposphere have been discovered. Outlook/Future work A corelation analysis of stratospheric BrO and NO2 will be performed discussing the stratospheric yearly cycle of BrO. Transport events from the polar troposphere towards mid-latitudes and into the free troposphere will be further investigated. Main publication Hollwedel et al. [2004], Hollwedel [2005]
Page 1:
Institut für Umweltphysik und Arbe
Page 5 and 6:
Contents 1 Introduction/Overview of
Page 7 and 8:
CONTENTS 7 3.2.1 Glaciological pilo
Page 9:
Introduction In Heidelberg, environ
Page 13 and 14:
Overview Summary Atmospheric resear
Page 15 and 16:
2.1. TROPOSPHERIC RESEARCH GROUP 15
Page 17 and 18:
Page 19 and 20:
Page 21 and 22:
Page 23 and 24:
Page 25 and 26:
Page 27 and 28: 2.1. TROPOSPHERIC RESEARCH GROUP 27
Page 33: 2.1. TROPOSPHERIC RESEARCH GROUP 33
Page 36 and 37: 36 CHAPTER 2. ATMOSPHERE AND REMOTE
Page 45 and 46: 2.3. RADIATIVE TRANSFER 45 2.3 Radi
Page 47 and 48: 2.3. RADIATIVE TRANSFER 47 Funding
Page 49 and 50: 2.3. RADIATIVE TRANSFER 49 2.3.2 Ox
Page 51 and 52: 2.3. RADIATIVE TRANSFER 51 2.3.4 At
Page 53: 2.3. RADIATIVE TRANSFER 53 Rothman,
Page 95 and 96: 2.6. MARHAL - MODELING OF MARINE AN
Page 105 and 106: 2.7. CARBON CYCLE GROUP 105 2.7 Car
Page 107 and 108: 2.7. CARBON CYCLE GROUP 107 Diploma
Page 109 and 110: 2.7. CARBON CYCLE GROUP 109 2.7.2 S
Page 111 and 112: 2.7. CARBON CYCLE GROUP 111 2.7.4 I
Page 113: 2.7. CARBON CYCLE GROUP 113 Schell,
Page 117 and 118: 3.1. SOIL PHYSICS 117 Overview We s
Page 119 and 120: 3.1. SOIL PHYSICS 119 In November 2
Page 121 and 122: 3.1. SOIL PHYSICS 121 Major Achieve
Page 123 and 124: 3.1. SOIL PHYSICS 123 3.1.2 X-ray a
Page 125 and 126: 3.1. SOIL PHYSICS 125 3.1.4 Near In
Page 127 and 128: 3.1. SOIL PHYSICS 127 3.1.6 Free Pa
Page 129 and 130:
3.1. SOIL PHYSICS 129 3.1.8 Unsatur
Page 131 and 132:
3.1. SOIL PHYSICS 131 3.1.10 Monito
Page 133 and 134:
3.1. SOIL PHYSICS 133 3.1.12 3D Ful
Page 135 and 136:
3.1. SOIL PHYSICS 135 References Ba
Page 137 and 138:
3.2. ICE AND CLIMATE 137 3.2 Ice an
Page 139 and 140:
3.2. ICE AND CLIMATE 139 regions) a
Page 141 and 142:
3.2. ICE AND CLIMATE 141 3.2.2 Cons
Page 143 and 144:
3.2. ICE AND CLIMATE 143 3.2.4 Clim
Page 145 and 146:
3.2. ICE AND CLIMATE 145 3.2.6 Nove
Page 147:
3.2. ICE AND CLIMATE 147 Preunkert,
Page 151 and 152:
4.1. GROUNDWATER AND PALEOCLIMATE 1
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
Page 159 and 160:
Page 161 and 162:
4.2. LAKE RESEARCH (LIMNOPHYSICS) 1
Page 163 and 164:
Page 165 and 166:
Page 167:
Small-Scale Air-Sea Interaction 5.1
Page 170 and 171:
170 CHAPTER 5. SMALL-SCALE AIR-SEA
Page 172 and 173:
Page 174 and 175:
Page 176 and 177:
Page 178 and 179:
Page 180 and 181:
Page 182 and 183:
Page 185:
Forschungsstelle “Radiometrie”
Page 188 and 189:
188 CHAPTER 6. FORSCHUNGSSTELLE “
Page 190 and 191:
Page 192 and 193:
Page 194 and 195:
Page 196 and 197:
Page 198 and 199:
Page 200 and 201:
Page 202 and 203:
Page 204 and 205:
Page 206 and 207:
Page 209 and 210:
7.1. PEER REVIEWED PUBLICATIONS 209
Page 211 and 212:
Page 213 and 214:
Page 215 and 216:
7.2. GREY PUBLICATIONS 215 Grey Pub
Page 217 and 218:
7.3. PHD THESES 217 PhD Theses Baye
Page 219 and 220:
7.4. DIPLOMA THESES 219 Diploma The
Page 221 and 222:
7.5. INVITED TALKS 221 Invited Talk
Page 223 and 224:
7.5. INVITED TALKS 223 Pundt, I. 20
Page 225:
Institut für Umweltphysik Im Neuen
show all

download pdf - Institut für Umweltphysik - Ruprecht-Karls-Universität ...

Create successful ePaper yourself

Delete template?

Save as template?