Long-term trends in stratospheric ozone, temperature, and water vapor over the Indian region
-
Published:2018-01-29
Issue:1
Volume:36
Page:149-165
-
ISSN:1432-0576
-
Container-title:Annales Geophysicae
-
language:en
-
Short-container-title:Ann. Geophys.
Author:
Akhil Raj Sivan Thankamani,Venkat Ratnam Madineni,Narayana Rao Daggumati,Krishna Murthy Boddam Venkata
Abstract
Abstract. We have investigated the long-term trends in and variabilities of
stratospheric ozone, water vapor and temperature over the Indian monsoon
region using the long-term data constructed from multi-satellite (Upper
Atmosphere Research Satellite (UARS MLS and HALOE, 1993–2005), Aura
Microwave Limb Sounder (MLS, 2004–2015), Sounding of the Atmosphere using
Broadband Emission Radiometry (SABER, 2002–2015) on board TIMED
(Thermosphere Ionosphere Mesosphere Energetics Dynamics)) observations
covering the period 1993–2015. We have selected two locations, namely,
Trivandrum (8.4∘ N, 76.9∘ E) and New Delhi (28∘ N,
77∘ E), covering northern and southern parts of the Indian region.
We also used observations from another station, Gadanki (13.5∘ N,
79.2∘ E), for comparison. A decreasing trend in ozone associated
with NOx chemistry in the tropical middle stratosphere is found, and the
trend turned to positive in the upper stratosphere. Temperature shows a
cooling trend in the stratosphere, with a maximum around 37 km over
Trivandrum (−1.71 ± 0.49 K decade−1) and New Delhi
(−1.15 ± 0.55 K decade−1). The observed cooling trend in the
stratosphere over Trivandrum and New Delhi is consistent with Gadanki lidar
observations during 1998–2011. The water vapor shows a decreasing trend in
the lower stratosphere and an increasing trend in the middle and upper
stratosphere. A good correlation between N2O and O3 is found in the
middle stratosphere (∼ 10 hPa) and poor correlation in the lower
stratosphere. There is not much regional difference in the water vapor and
temperature trends. However, upper stratospheric ozone trends over Trivandrum
and New Delhi are different. The trend analysis carried out by varying the
initial year has shown significant changes in the estimated
trend. Keywords. Atmospheric composition and structure (middle atmosphere – composition and chemistry; troposphere – composition and chemistry) – meteorology and atmospheric dynamics (climatology)
Publisher
Copernicus GmbH
Subject
Space and Planetary Science,Earth and Planetary Sciences (miscellaneous),Atmospheric Science,Geology,Astronomy and Astrophysics
Reference41 articles.
1. Akhil Raj, S. T., Venkat Ratnam, M., Narayana Rao, D., and Krishna Murthy, B. V.: Vertical distribution of ozone over a tropical station: Seasonal variation and comparison with satellite (MLS, SABER) and ERA-Interim products, Atmos. Environ., 116, 281–292, https://doi.org/10.1016/j.atmosenv.2015.06.047, 2015. 2. Brasseur, G. P. and Solomon, S.: Aeronomy of the middle atmosphere: Chemistry and physics of the stratosphere and mesosphere, Planet. Space Sci., 644, Springer, the Netherlands, 2005. 3. Butchart, N.: The Brewer-Dobson circulation, Rev. Geophys., 52, 157–184, 2014. 4. Butchart, N. and Scaife, A. A.: Removal of chlorofluorocarbons by increased mass exchange between the stratosphere and troposphere in a changing climate, Nature, 410, 799–802, 2001. 5. Connor, B. J., Mooney, T., Nedoluha, G. E., Barrett, J. W., Parrish, A., Koda, J., Santee, M. L., and Gomez, R. M.: Re-analysis of ground-based microwave ClO measurements from Mauna Kea, 1992 to early 2012, Atmos. Chem. Phys., 13, 8643–8650, https://doi.org/10.5194/acp-13-8643-2013, 2013.
Cited by
18 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
|
|