The SPARC water vapor assessment II: intercomparison of satellite and ground-based microwave measurements
-
Published:2017-12-06
Issue:23
Volume:17
Page:14543-14558
-
ISSN:1680-7324
-
Container-title:Atmospheric Chemistry and Physics
-
language:en
-
Short-container-title:Atmos. Chem. Phys.
Author:
Nedoluha Gerald E., Kiefer Michael, Lossow StefanORCID, Gomez R. Michael, Kämpfer Niklaus, Lainer MartinORCID, Forkman Peter, Christensen Ole MartinORCID, Oh Jung JinORCID, Hartogh PaulORCID, Anderson John, Bramstedt KlausORCID, Dinelli Bianca M.ORCID, Garcia-Comas MayaORCID, Hervig Mark, Murtagh DonalORCID, Raspollini PieraORCID, Read William G., Rosenlof KarenORCID, Stiller Gabriele P.ORCID, Walker Kaley A.ORCID
Abstract
Abstract. As part of the second SPARC (Stratosphere–troposphere Processes And their Role in Climate) water vapor assessment (WAVAS-II), we present measurements taken from or coincident with seven sites from which ground-based microwave instruments measure water vapor in the middle atmosphere. Six of the ground-based instruments are part of the Network for the Detection of Atmospheric Composition Change (NDACC) and provide datasets that can be used for drift and trend assessment. We compare measurements from these ground-based instruments with satellite datasets that have provided retrievals of water vapor in the lower mesosphere over extended periods since 1996. We first compare biases between the satellite and ground-based instruments from the upper stratosphere to the upper mesosphere. We then show a number of time series comparisons at 0.46 hPa, a level that is sensitive to changes in H2O and CH4 entering the stratosphere but, because almost all CH4 has been oxidized, is relatively insensitive to dynamical variations. Interannual variations and drifts are investigated with respect to both the Aura Microwave Limb Sounder (MLS; from 2004 onwards) and each instrument's climatological mean. We find that the variation in the interannual difference in the mean H2O measured by any two instruments is typically ∼ 1%. Most of the datasets start in or after 2004 and show annual increases in H2O of 0–1 % yr−1. In particular, MLS shows a trend of between 0.5 % yr−1 and 0.7 % yr−1 at the comparison sites. However, the two longest measurement datasets used here, with measurements back to 1996, show much smaller trends of +0.1 % yr−1 (at Mauna Loa, Hawaii) and −0.1 % yr−1 (at Lauder, New Zealand).
Publisher
Copernicus GmbH
Subject
Atmospheric Science
Reference38 articles.
1. Boone, C. D., Nassar, R., Walker, K. A., Rochon, Y., McLeod, S. D., Rinsland, C. P., and Bernath, P. F.: Retrievals for the Atmospheric Chemistry Experiment Fourier-Transform Spectrometer, Appl. Opt., 44, 7218–7231, 2005. 2. Boone, C. D., Walker, K. A., and Bernath, P. F.: Version 3 Retrievals for the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS), The Atmospheric Chemistry Experiment ACE at 10: A Solar Occultation Anthology, edited by: Bernath, P. F., A. Deepak Publishing, Hampton, Virginia, USA, 103–127, 2013. 3. Connor, B. J., Parrish, A., and Tsou, J. J.: Detection of stratospheric ozone trends by ground-based microwave observations, in: Remote Sensing of Atmospheric Chemistry, edited by: McElroy, J. L. and McNeal, R., Proc. SPIE Int. Soc. Opt. Eng., 1491, 218–230, 1991. 4. DeWachter, E., Haefele, A., Kämpfer, N., Ka, S., Lee, J. E., and Oh, J. J.: The Seoul Water Vapour Radiometer for the Middle Atmosphere; Calibration, Retrieval and Validation, Transactions on Geoscience and Remote Sensing, 49, 1052–1062, https://doi.org/10.1109/TGRS.2010.2072932, 2011. 5. Deuber, B., Haefele, A., Feist, D. G., Martin, L., Kämpfer, N., Nedoluha, G. E., Yushkov, V., Khaykin, S., Kivi, R., and Vomel, H.: Middle Atmospheric Water Vapour Radiometer – MIAWARA: Validation and first results of the LAUTLOS / WAVVAP campaign, J. Geophys. Res., 110, D13306, https://doi.org/10.1029/2004JD005543, 2005.
Cited by
13 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|