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DOI | 10.1002/joc.6073 |
Identification of homogeneous regions of near surface air temperature lapse rates across India | |
Ojha, Richa | |
2019-09-01 | |
发表期刊 | INTERNATIONAL JOURNAL OF CLIMATOLOGY
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ISSN | 0899-8418 |
EISSN | 1097-0088 |
出版年 | 2019 |
卷号 | 39期号:11页码:4288-4304 |
文章类型 | Article |
语种 | 英语 |
国家 | India |
英文摘要 | Spatial variation of near surface temperature lapse rate is usually analysed by subjectively dividing the study area in to different sub-regions based on political or physiographic boundaries. This can often lead to unreliable results as near surface temperature lapse rate largely depends on regional conditions. In this study, homogeneous regions of near surface air temperature lapse rate across India have been identified for monthly mean minimum, mean, and mean maximum temperature using a probabilistic Gaussian mixture model clustering approach. For the delineated regions, lapse rates are estimated using weighted linear regression model. The weights corresponding to each station were obtained from the clustering approach. Results indicate that regions with uniform lapse rate vary across different months and a minimum of three regions is obtained for maximum temperature in April month. Further, temperature lapse rate estimates exhibit spatial and temporal variability, and are less steep than the Environmental lapse rate (-6.5 degrees C/km). The maximum spatial variability in lapse rate is observed in May for both maximum and minimum temperature. The delineation of entire India into homogeneous regions improves temperature interpolation when compared to results obtained by considering entire India as one region. A maximum improvement of 34% in root mean square error is observed in prediction of monthly mean temperature in March. The identified regions and the associated lapse rates are expected to improve the prediction of near surface temperature at ungauged locations across India. |
英文关键词 | cluster analysis India lapse rate regions temperature |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000483703900007 |
WOS关键词 | LONG-TERM TRENDS ; VARIABILITY ; INVERSION ; GLACIERS ; DROUGHT ; MAXIMUM ; RADAR |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/186710 |
专题 | 气候变化 |
作者单位 | Indian Inst Technol, Dept Civil Engn, Kanpur, Uttar Pradesh, India |
推荐引用方式 GB/T 7714 | Ojha, Richa. Identification of homogeneous regions of near surface air temperature lapse rates across India[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2019,39(11):4288-4304. |
APA | Ojha, Richa.(2019).Identification of homogeneous regions of near surface air temperature lapse rates across India.INTERNATIONAL JOURNAL OF CLIMATOLOGY,39(11),4288-4304. |
MLA | Ojha, Richa."Identification of homogeneous regions of near surface air temperature lapse rates across India".INTERNATIONAL JOURNAL OF CLIMATOLOGY 39.11(2019):4288-4304. |
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