Journal of earth system science | |
Variations of trace gases over the Bay of Bengal during the summer monsoon | |
Narendra Ojha^21  K Ravi Kumar^4,52  Prabha R Nair^13  Yogesh K Tiwari^34  I A Girach^15  | |
[1] Department of Atmospheric Chemistry, Max Planck Institute for Chemistry, 55128 Mainz, Germany.^2;Department of Environmental Geochemical Cycle Research, JAMSTEC, Yokohama, Japan.^5;Indian Institute of Tropical Meteorology, Pune 411 008, India.^3;National Institute of Polar Research, Tachikawa, Japan.^4;Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram 695 022, India.^1 | |
关键词: Ozone; carbon monoxide; methane; monsoon; Bay of Bengal; MACC reanalysis; | |
DOI : | |
学科分类:天文学(综合) | |
来源: Indian Academy of Sciences | |
【 摘 要 】
In situ measurements of near-surface ozone (Oâ), carbon monoxide (CO), and methane (CHâ) were carried out over the Bay of Bengal (BoB) as a part of the Continental Tropical Convergence Zone (CTCZ) campaign during the summer monsoon season of 2009. Oâ, CO and CHâ mixing ratios varied in the ranges of 8â54 ppbv, 50â200 ppbv and 1.57â2.15 ppmv, respectively during 16 Julyâ17 August 2009. The spatial distribution of mean tropospheric Oâ from satellite retrievals is found to be similar to that in surfaceOâ observations, with higher levels over coastal and northern BoB as compared to central BoB. The comparison of in situ measurements with the Monitoring Atmospheric Composition & Climate (MACC) global reanalysis shows that MACC simulations reproduce the observations with small mean biases of1.6 ppbv, â2.6 ppbv and 0.07 ppmv for Oâ, CO and CH4, respectively. The analysis of diurnal variation of Oâ based on observations and the simulations from Weather Research and Forecasting coupled with Chemistry (WRF-Chem) at a stationary point over the BoB did not show a net photochemical build up during daytime. Satellite retrievals show limitations in capturing CHâ variations as measured by in situ sample analysis highlighting the need of more shipborne in situ measurements of trace gases over thisregion during monsoon.
【 授权许可】
CC BY
【 预 览 】
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