Urbanization Effect on Changes in Extreme Climate Events in Urumqi, China, from 1976 to 2018

Author:

Abulimiti Aerzuna1,Liu Yongqiang1,Yang Lianmei234,Abulikemu Abuduwaili1ORCID,Mamitimin Yusuyunjiang1,Yuan Shuai1,Enwer Reifat1,Li Zhiyi1ORCID,Abuduaini Abidan1,Kadier Zulipina1

Affiliation:

1. Xinjiang Key Laboratory of Oasis Ecology, College of Geography and Remote Sensing Sciences, Xinjiang University, Urumqi 830017, China

2. Institute of Desert Meteorology, China Meteorological Administration (CMA), Urumqi 830002, China

3. Field Scientific Observation Base of Cloud Precipitation Physics in West Tianshan Mountains, Urumqi 830002, China

4. Xinjiang Cloud Precipitation Physics and Cloud Water Resources Development Laboratory, Urumqi 830002, China

Abstract

This study investigates, for the first time, the urbanization effect (UE) on local extreme climate events in Urumqi, China, based on 22 indices of climate extremes, which are calculated with daily observation data from 1976 to 2018. These analyses reveal a pronounced nocturnal urban heat island (UHI) effect and a daytime urban cold island (UCI) effect. Due to Urumqi’s arid climate background, the UCI effect is considered a unique feature of the UE, which significantly differs from those in eastern and northern China. The UE on the TR20 index (number of days with minimum daily temperature exceeding 20 °C) reached 5.22 d/10a, indicating that urbanization has led to a fast increase in the number of hot nights in Urumqi. The absolute averaged UE on the indices measuring the frequency of warm events is about twice as large as that on the indices measuring the frequency of cold events, while that on the indices measuring the intensity of warm events is about one third of that on the indices measuring the intensity of cold events. The highest averaged urbanization contributions (UCs) to the extreme warm and cold events are represented by the frequency indices and the intensity indices, respectively, while those contributing to the extreme precipitation events are represented by the duration indices. Moreover, urbanization probably exacerbates the degree of wetting in the overall “warming and wetting” climate trend of the region. These findings can be seen as new evidence to provide scientific basis for further investigation of the UE on climate changes in arid regions.

Funder

Tianshan Mountains Talent Project

Key Research and Development Program of Xinjiang Uygur Autonomous Region

National Key Research and Development Program of China

National Natural Science Foundation of China

Natural Science Foundation of Xinjiang Uygur Autonomous Region

Graduate Innovation Project of Xinjiang University

Publisher

MDPI AG

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