Validation and data characteristics of nitrous oxide and methane profiles observed by the Improved Limb Atmospheric Spectrometer (ILAS) and processed with the Version 5.20 algorithm

American Geophysical Union (AGU) - Tập 108 Số D16 - 2003
Hiroshi Kanzawa1,2, T. Sugita1, H. Nakajima1, G. E. Bodeker3, H. Oelhaf4, M. Stowasser4, G. Wetzel4, Andreas Engel5, Ulrich Schmidt5, Ingeborg Levin6, Geoffrey C. Toon7, B. Sen7, Jean-François Blavier7, Shuji Aoki8, Takakiyo Nakazawa8, K. W. Jucks9, D. G. Johnson9,10, Wesley A. Traub9, C. Camy‐Peyret11, Sébastien Payan11, Pascal Jeseck11, Isao Murata12, H. Fukunishi12, M. von König13, H. Bremer13, H. Küllmann13, Jun-Ho Park14, Laura L. Pan15, Tatsuya Yokota1, Makoto Suzuki1,16, Masato Shiotani17,18, Yasuhiro Sasano1
1National Institute for Environmental Studies, Tsukuba, Japan
2Now at Division of Earth and Environmental Sciences, Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan.
3National Institute of Water and Atmospheric Research, Lauder, New Zealand
4Institut für Meteorologie und Klimaforschung, Forschungszentrum Karlsruhe Universität Karlsruhe, Karlsruhe, Germany
5Institut für Meteorologie J. W. Goethe Universität Frankfurt Frankfurt Germany
6Institut für Umweltphysik, Universität Heidelberg, Heidelberg, Germany
7Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California USA
8Center for Atmospheric and Oceanic Studies, Graduate School of Science, Tohoku University, Sendai, Japan
9Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts, USA
10Now at NASA Langley Research Center, Hampton, Virginia, USA.
11Laboratoire de Physique Moléculaire et Applications Université Pierre et Marie Curie/Centre National de la Recherche Scientifique Paris France
12Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Japan
13Institut für Umweltphysik, Universität Bremen, Bremen, Germany
14NASA, Langley Research Center, Hampton, Virginia, USA
15National Center for Atmospheric Research, Boulder Colorado USA
16Now at National Space Development Agency of Japan/Earth Observation Research Center, Tokyo, Japan.
17Graduate School of Environmental Earth Science, Hokkaido University, Sapporo, Japan
18Now at Radio Science Center for Space and Atmosphere, Kyoto University, Kyoto, Japan.

Tóm tắt

Vertical profiles of nitrous oxide and methane at high latitudes (57–72°N; 64–89°S) were observed by the Improved Limb Atmospheric Spectrometer (ILAS) solar occultation sensor aboard Advanced Earth Observing Satellite. These measurements were made continuously from November 1996 through June 1997 with some additional periods in September–October 1996. A validation study of the nitrous oxide and methane data processed with the Version 5.20 ILAS retrieval algorithm is presented in this paper. Comparisons are made with (1) nitrous oxide and methane obtained by the ILAS validation balloon campaigns at Kiruna, Sweden, and at Fairbanks, Alaska, in the Arctic; (2) nitrous oxide and methane by the Photochemistry of Ozone Loss in the Arctic Region in Summer aircraft campaign in the Arctic; (3) nitrous oxide by the ground‐based spectroscopic measurements and by the aircraft‐based remote sensing measurements in the Arctic; and (4) methane by satellite measurements of the Version 19 Halogen Occultation Experiment in the Arctic and Antarctic. Comparisons of ILAS nitrous oxide and methane with Upper Atmosphere Research Satellite Reference Atmosphere data are also made. The results of the comparisons and additional ILAS internal consistency analyses are as follows: (1) the uncertainty of ILAS nitrous oxide is better than 10% over 10–30 km in altitude, and is larger than 50% over 30–40 km, which is comparable to the expected total errors of the ILAS measurements; (2) the uncertainty of ILAS methane is better than 10% over 10–50 km, except for 15–30 km in winter with positive biases exceeding 20%, which is smaller than or comparable to the expected total errors of the ILAS measurements (the quality of ILAS methane in the polar lower stratosphere is better in summer than in winter). In summary, the characteristics of ILAS measurements, i.e., high sampling frequency in polar latitudes with high vertical resolution, along with the good quality of ILAS Version 5.20 nitrous oxide for 10–40 km and the good quality of ILAS Version 5.20 methane for 10–50 km except for 15–30 km in winter, make the ILAS nitrous oxide and methane data set valuable for scientific study of various polar stratospheric phenomena.

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American Geophysical Union (AGU)

Tập 108 Số D16

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