DOI: 10.1016/j.atmosenv.2014.01.061
Scopus记录号: 2-s2.0-84894259055
论文题名: Spatio-temporal analysis of rainfall trends over a maritime state (Kerala) of India during the last 100 years
作者: Nair A ; , Ajith Joseph K ; , Nair K ; S
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 88 起始页码: 123
结束页码: 132
语种: 英语
英文关键词: Kerala
; Rainfall variability
; Seasonality index
; Trend
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Kerala, a maritime state of India is bestowed with abundant rainfall which is about three times the national average. This study is conducted to have a better understanding of rainfall variability and trend at regional level for this state during the last 100 years. It is found that the rainfall variation in northern and southern regions of Kerala is large and the deviation is on different timescales. There is a shifting of rainfall mean and variability during the seasons. The trend analysis on rainfall data over the last 100 years reveals that there is a significant (99%) decreasing trend in most of the regions of Kerala especially in the month of January, July and November. The annual and seasonal trends of rainfall in most regions of Kerala are also found to be decreasing significantly. This decreasing trend may be related to global anomalies as a result of anthropogenic green house gas (GHG) emissions due to increased fossil fuel use, land-use change due to urbanisation and deforestation, proliferation in transportation associated atmospheric pollutants. We have also conducted a study of the seasonality index (SI) and found that only one district in the northern region (Kasaragod) has seasonality index of more than 1 and that the distribution of monthly rainfall in this district is mostly attributed to 1 or 2 months. In rest of the districts, the rainfall is markedly seasonal. The trend in SI reveals that the rainfall distribution in these districts has become asymmetric with changes in rainfall distribution. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80700
Appears in Collections: 气候变化事实与影响
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作者单位: Nansen Environmental Research Centre (India), 6A, Oxford Business Centre, Kochi 682016, Kerala, India; Centre for Earth Research and Environment Management, Kochi 682036, Kerala, India
Recommended Citation:
Nair A,, Ajith Joseph K,, Nair K,et al. Spatio-temporal analysis of rainfall trends over a maritime state (Kerala) of India during the last 100 years[J]. Atmospheric Environment,2014-01-01,88