Validation of five years (2003-2007) of SCIAMACHY CO total column measurements using ground-based spectrometer observations
Journal article, 2010

This paper presents a validation study of SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY) carbon monoxide (CO) total column measurements from the Iterative Maximum Likelihood Method (IMLM) algorithm using ground-based spectrometer observations from twenty surface stations for the five year time period of 2003-2007. Overall we find a good agreement between SCIAMACHY and ground-based observations for both mean values as well as seasonal variations. For high-latitude Northern Hemisphere stations absolute differences between SCIAMACHY and ground-based measurements are close to or fall within the SCIAMACHY CO 2 sigma precision of 0.2 x 10(18) molecules/cm(2) (similar to 10%) indicating that SCIAMACHY can observe CO accurately at high Northern Hemisphere latitudes. For Northern Hemisphere mid-latitude stations the validation is complicated due to the vicinity of emission sources for almost all stations, leading to higher ground-based measurements compared to SCIAMACHY CO within its typical sampling area of 8 degrees x 8 degrees. Comparisons with Northern Hemisphere mountain stations are hampered by elevation effects. After accounting for these effects, the validation provides satisfactory results. At Southern Hemisphere mid-to high latitudes SCIAMACHY is systematically lower than the ground-based measurements for 2003 and 2004, but for 2005 and later years the differences between SCIAMACHY and ground-based measurements fall within the SCIAMACHY precision. The 2003-2004 bias is consistent with previously reported results although its origin remains under investigation. No other systematic spatial or temporal biases could be identified based on the validation presented in this paper. Validation results are robust with regard to the choices of the instrument-noise error filter, sampling area, and time averaging required for the validation of SCIAMACHY CO total column measurements. Finally, our results show that the spatial coverage of the ground-based measurements available for the validation of the 2003-2007 SCIAMACHY CO columns is sub-optimal for validation purposes, and that the recent and ongoing expansion of the ground-based network by carefully selecting new locations may be very beneficial for SCIAMACHY CO and other satellite trace gas measurements validation efforts.

analysis

space

ftir measurements

retrievals

wfm-doas

error

northern japan

ch4

atmospheric carbon-monoxide

methane

variability

Author

A. T. J. de Laat

Netherlands Institute for Space Research (SRON)

Royal Netherlands Meteorological Institute

A. M. S. Gloudemans

Netherlands Institute for Space Research (SRON)

H. Schrijver

Netherlands Institute for Space Research (SRON)

I. Aben

Netherlands Institute for Space Research (SRON)

Y. Nagahama

Yokohama National University

K. Suzuki

Yokohama University

E. Mahieu

University of Liège

N. B. Jones

University of Wollongong

C. Paton-Walsh

University of Wollongong

N. M. Deutscher

University of Wollongong

D. W. T. Griffith

University of Wollongong

M. De Maziere

Belgian Institute for Space Aeronomy

R. L. Mittermeier

Environment Canada

H. Fast

Environment Canada

J. Notholt

Universität Bremen

M. Palm

Universität Bremen

T. Hawat

Denver University

T. Blumenstock

Karlsruhe Institute of Technology (KIT)

F. Hase

Karlsruhe Institute of Technology (KIT)

M. Schneider

Karlsruhe Institute of Technology (KIT)

C. Rinsland

NASA Langley Research Center

A. V. Dzhola

Saint Petersburg State University - Spsu

E. I. Grechko

Saint Petersburg State University - Spsu

A. M. Poberovskii

Russian Academy of Sciences

M. V. Makarova

Russian Academy of Sciences

Johan Mellqvist

Chalmers, Department of Radio and Space Science, Optical Remote Sensing

Anders Strandberg

Chalmers, Department of Radio and Space Science, Optical Remote Sensing

R. Sussmann

Karlsruhe Institute of Technology (KIT)

T. Borsdorff

Karlsruhe Institute of Technology (KIT)

M. Rettinger

Karlsruhe Institute of Technology (KIT)

Atmospheric Measurement Techniques

1867-1381 (ISSN) 1867-8548 (eISSN)

Vol. 3 5 1457-1471

Subject Categories

Earth and Related Environmental Sciences

DOI

10.5194/amt-3-1457-2010

More information

Latest update

7/2/2018 1