Spatio-temporal characteristics of rainfall and drought conditions are using the different drought indices with geospatial approaches in Karnataka state

IF 1.8 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Journal of Atmospheric and Solar-Terrestrial Physics Pub Date : 2024-10-16 DOI:10.1016/j.jastp.2024.106372

Harishnaika N, Arpitha M, S.A Ahmed

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引用次数: 0

Abstract

Karnataka state drought conditions are assessed via drought indices. Over the past several decades, several indices of drought (DI) have been developed and presented, although some of them are region-specific and have problems regarding their applicability to other climatic circumstances. Additionally, choosing the best DI time step to illustrate the drought condition is difficult because of the DIs' various time steps. The study compares the Standardized Precipitation Index (SPI), Statistical Z-Score, China Z-Index (CZI), Rainfall Anomaly Index (RAI), and Rainfall Departure (RD) to determine which one is most appropriate for the districts of the Karnataka state that are prone to both dry and rainy conditions. This study has pointed out that the best drought indices are SPI and RD, and the least accountable drought indice is China Z index. Droughts were most common in 22 districts in 2009, which represent around 70.97% of the state's landmass. In comparison with the rest of the districts, the Ramanagara district noticed the worst drought conditions in 2003, with rainfall reaching 92.47 mm and SPI -3.68, RAI-6.04, MCZI -2.39, and Z score −2.62. Overall, the results of the study will aid in the organization and improvement of drought, flood, agriculture, and water resource management approaches in the state.

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在卡纳塔克邦利用不同的干旱指数和地理空间方法分析降雨和干旱状况的时空特征

卡纳塔克邦的干旱状况是通过干旱指数来评估的。在过去的几十年中，已经开发并提出了多个干旱指数（DI），但其中一些是针对特定地区的，在适用于其他气候条件方面存在问题。此外，由于 DIs 的时间步长各不相同，因此很难选择最佳的 DI 时间步长来说明干旱状况。本研究比较了标准化降水指数 (SPI)、统计 Z 值、中国 Z 指数 (CZI)、降雨异常指数 (RAI) 和降雨离差 (RD)，以确定哪种指数最适合卡纳塔克邦既干旱又多雨的地区。这项研究指出，最好的干旱指数是 SPI 和 RD，最不可靠的干旱指数是中国 Z 指数。2009 年，22 个县的干旱最为普遍，约占该邦国土面积的 70.97%。与其他地区相比，拉马纳加拉地区在 2003 年的旱情最为严重，降雨量达到 92.47 毫米，SPI 为-3.68，RAI 为-6.04，MCZI 为-2.39，Z 指数为-2.62。总之，研究结果将有助于组织和改进该州的干旱、洪水、农业和水资源管理方法。

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来源期刊

Journal of Atmospheric and Solar-Terrestrial Physics 地学-地球化学与地球物理

CiteScore

4.10

自引率

5.30%

发文量

审稿时长

6 months

期刊介绍： The Journal of Atmospheric and Solar-Terrestrial Physics (JASTP) is an international journal concerned with the inter-disciplinary science of the Earth''s atmospheric and space environment, especially the highly varied and highly variable physical phenomena that occur in this natural laboratory and the processes that couple them. The journal covers the physical processes operating in the troposphere, stratosphere, mesosphere, thermosphere, ionosphere, magnetosphere, the Sun, interplanetary medium, and heliosphere. Phenomena occurring in other "spheres", solar influences on climate, and supporting laboratory measurements are also considered. The journal deals especially with the coupling between the different regions. Solar flares, coronal mass ejections, and other energetic events on the Sun create interesting and important perturbations in the near-Earth space environment. The physics of such "space weather" is central to the Journal of Atmospheric and Solar-Terrestrial Physics and the journal welcomes papers that lead in the direction of a predictive understanding of the coupled system. Regarding the upper atmosphere, the subjects of aeronomy, geomagnetism and geoelectricity, auroral phenomena, radio wave propagation, and plasma instabilities, are examples within the broad field of solar-terrestrial physics which emphasise the energy exchange between the solar wind, the magnetospheric and ionospheric plasmas, and the neutral gas. In the lower atmosphere, topics covered range from mesoscale to global scale dynamics, to atmospheric electricity, lightning and its effects, and to anthropogenic changes.