期刊
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
卷 119, 期 3, 页码 1612-1625出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2013JD020757
关键词
water vapor; stratosphere; measurements
资金
- NOAA Climate Program Office
- US Global Climate Observing System (GCOS) program
- National Aeronautics and Space Administration Upper Atmosphere Research Program
- National Aeronautics and Space Administration
- Office Of The Director
- Office Of Internatl Science &Engineering [1158805] Funding Source: National Science Foundation
Differences between stratospheric water vapor measurements by NOAA frost point hygrometers (FPHs) and the Aura Microwave Limb Sounder (MLS) are evaluated for the period August 2004 through December 2012 at Boulder, Colorado, Hilo, Hawaii, and Lauder, New Zealand. Two groups of MLS profiles coincident with the FPH soundings at each site are identified using unique sets of spatiotemporal criteria. Before evaluating the differences between coincident FPH and MLS profiles, each FPH profile is convolved with the MLS averaging kernels for eight pressure levels from 100 to 26 hPa (similar to 16 to 25 km) to reduce its vertical resolution to that of the MLS water vapor retrievals. The mean FPH-MLS differences at every pressure level (100 to 26 hPa) are well within the combined measurement uncertainties of the two instruments. However, the mean differences at 100 and 83 hPa are statistically significant and negative, ranging from -0.460.22 ppmv (-10.34.8%) to -0.100.05 ppmv (-2.21.2%). Mean differences at the six pressure levels from 68 to 26 hPa are on average 0.8% (0.04 ppmv), and only a few are statistically significant. The FPH-MLS differences at each site are examined for temporal trends using weighted linear regression analyses. The vast majority of trends determined here are not statistically significant, and most are smaller than the minimum trends detectable in this analysis. Except at 100 and 83 hPa, the average agreement between MLS retrievals and FPH measurements of stratospheric water vapor is better than 1%.
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