Validation of Aura Microwave Limb Sounder BrO observations in the stratosphere

被引：14

作者：

Kovalenko, L. J. ^{[1
]}

Livesey, N. L. ^{[1
]}

Salawitch, R. J. ^{[1
,2
]}

Camy-Peyret, C. ^{[3
]}

Chipperfield, M. P. ^{[4
]}

Cofield, R. E. ^{[1
]}

Dorf, M. ^{[5
]}

Drouin, B. J. ^{[1
]}

Froidevaux, L. ^{[1
]}

Fuller, R. A. ^{[1
]}

Goutail, F. ^{[6
]}

Jarnot, R. F. ^{[1
]}

Jucks, K. ^{[7
]}

Knosp, B. W. ^{[1
]}

Lambert, A. ^{[1
]}

MacKenzie, I. A. ^{[8
]}

Pfeilsticker, K. ^{[5
]}

Pommereau, J. -P. ^{[6
]}

Read, W. G. ^{[1
]}

Santee, M. L. ^{[1
]}

Schwartz, M. J. ^{[1
]}

Snyder, W. V. ^{[1
]}

Stachnik, R. ^{[1
]}

Stek, P. C. ^{[1
]}

Wagner, P. A. ^{[1
]}

Waters, J. W. ^{[1
]}

机构：

[1] CALTECH, Jet Prop Lab, Pasadena, CA 91125 USA

[2] Univ Maryland, Dept Atmospher & Ocean Sci, College Pk, MD 20742 USA

[3] Univ Paris 06, Lab Phys Mol Atmosphere & Astrophys, Paris, France

[4] Univ Leeds, Sch Earth Environm, Inst Atmospher Sci, Leeds, W Yorkshire, England

[5] Heidelberg Univ, Inst Environm Phys, Heidelberg, Germany

[6] CNRS, Serv Aeron, F-91371 Verrieres Le Buisson, France

[7] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[8] Univ Edinburgh, Sch Geosci, Edinburgh, Midlothian, Scotland

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES | 2007年 / 112卷 / D24期

基金：

英国自然环境研究理事会;

关键词：

D O I：

10.1029/2007JD008817

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

Validation of stratospheric BrO vertical profiles obtained by the Microwave Limb Sounder (MLS) on the Aura satellite is discussed. MLS BrO measurements are compared with expectations of its latitudinal and seasonal dependence, as well as with more localized balloon-borne measurements of BrO. We describe the expected precision and systematic errors of the version 2.2 retrieval and show that scientific studies using MLS BrO vertical profiles require extensive averaging to increase the signal-to-noise ratio to useful values. A monthly zonal mean over a 10 degrees latitude bin ( about 3,000 individual profiles) results in a precision of approximately +/- 4 ppt (similar to 25% of a typical daytime signal). Moreover, it is necessary to take day/night differences to remove large biases. The pressure range over which the data are considered useful is 10 to 3.2 hPa. Over this range, the estimated accuracy in the day/night difference is about +/- 20%. The vertical resolution is 5.5 km for 10 to 3.2 hPa. Day/night differences are a good measure of daytime BrO from 10 to 4.6 hPa; for 3.2 hPa the nonnegligible nighttime BrO needs to be accounted for. We infer total inorganic bromine (Br-y) to be 22.1 +/- 5.5 ppt on the basis of analysis of MLS measurements of BrO, which implies a contribution of 6.5 +/- 5.5 ppt to stratospheric bromine from sources other than long-lived CH3Br and halons.

引用

页数：17

共 34 条

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