How bias correction goes wrong: measurement of XCO2 affected by erroneous surface pressure estimates

被引：122

作者：

Kiel, Matthaus ^{[1
]}

O'Dell, Christopher W. ^{[4
]}

Fisher, Brendan ^{[3
]}

Eldering, Annmarie ^{[3
]}

Nassar, Ray ^{[5
]}

MacDonald, Cameron G. ^{[6
]}

Wennberg, Paul O. ^{[1
,2
]}

机构：

[1] CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA

[2] CALTECH, Div Engn & Appl Sci, Pasadena, CA 91125 USA

[3] CALTECH, Jet Prop Lab, Pasadena, CA USA

[4] Colorado State Univ, Ft Collins, CO 80523 USA

[5] Environm & Climate Change Canada, Climate Res Div, Toronto, ON, Canada

[6] Univ Waterloo, Dept Phys & Astron, Waterloo, ON, Canada

来源：

ATMOSPHERIC MEASUREMENT TECHNIQUES | 2019年 / 12卷 / 04期

关键词：

ORBITING CARBON OBSERVATORY-2; CO2 RETRIEVAL ALGORITHM; VALIDATION; DIOXIDE; CALIBRATION; INSTRUMENT; FLUXES;

D O I：

10.5194/amt-12-2241-2019

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

All measurements of X-CO2 from space have systematic errors. To reduce a large fraction of these errors, a bias correction is applied to X-CO2 retrieved from GOSAT and OCO-2 spectra using the ACOS retrieval algorithm. The bias correction uses, among other parameters, the surface pressure difference between the retrieval and the meteorological reanalysis. Relative errors in the surface pressure estimates, however, propagate nearly 1 V 1 into relative errors in biascorrected X-CO2. For OCO-2, small errors in the knowledge of the pointing of the observatory (up to similar to 130 arcsec) introduce a bias in X-CO2 in regions with rough topography. Erroneous surface pressure estimates are also caused by a coding error in ACOS version 8, sampling meteorological analyses at wrong times ( up to 3 h after the overpass time). Here, we derive new geolocations for OCO-2' s eight footprints and show how using improved knowledge of surface pressure estimates in the bias correction reduces errors in OCO-2' s v9 X-CO2 data.

引用

页码：2241 / 2259

页数：19

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