Relationships between Spatial and Temporal Variations in Precipitation, Climatic Indices, and the Normalized Differential Vegetation Index in the Upper and Middle Reaches of the Heihe River Basin, Northwest China
Changes in precipitation are critical indicators of climate change. In this study, the daily precipitation records from 10 meteorological stations in the Heihe River Basin, Northwest China from 1961−2016, precipitation indices, climate indices, and the normalized differential vegetation index (NDVI)...
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ftdoajarticles:oai:doaj.org/article:de19e3ae83644d8e8f56911e0bc3d84e 2023-05-15T15:14:56+02:00 Relationships between Spatial and Temporal Variations in Precipitation, Climatic Indices, and the Normalized Differential Vegetation Index in the Upper and Middle Reaches of the Heihe River Basin, Northwest China Fanglei Zhong Qingping Cheng Yinchun Ge 2019-07-01T00:00:00Z https://doi.org/10.3390/w11071394 https://doaj.org/article/de19e3ae83644d8e8f56911e0bc3d84e EN eng MDPI AG https://www.mdpi.com/2073-4441/11/7/1394 https://doaj.org/toc/2073-4441 2073-4441 doi:10.3390/w11071394 https://doaj.org/article/de19e3ae83644d8e8f56911e0bc3d84e Water, Vol 11, Iss 7, p 1394 (2019) precipitation indices large-scale circulations NDVI Heihe River Basin Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 article 2019 ftdoajarticles https://doi.org/10.3390/w11071394 2022-12-30T21:28:44Z Changes in precipitation are critical indicators of climate change. In this study, the daily precipitation records from 10 meteorological stations in the Heihe River Basin, Northwest China from 1961−2016, precipitation indices, climate indices, and the normalized differential vegetation index (NDVI) were investigated using the Pearson, Kendall, and Spearman correlation coefficients; Theil-Sen Median; Mann−Kendall test; and wavelet coherence. The results indicated that the occurrences (fractional contributions) of 1−2-day wet periods were 81.3% (93.9%) and 55.3% (82.1%) in the upper (UHRB) and middle (MHRB) reaches of the Heihe River Basin, respectively. The spatial distribution of the occurrences (fractional contributions) was almost consistent with non-significant increases/decreases at stations. The ATP, ATD, API, and AMRD increased, while precipitation regimes suggest that dry seasons are getting wetter, and wet seasons are getting drier, although these changes were not significant. Wavelet coherence analyses showed that climate indices influenced precipitation, mainly its concentration, on a 4- to 78.6-month timescale. The Pearson, Kendall, and Spearman correlation coefficients showed weak lagged linkages between precipitation and the North Arctic Oscillation (NAO), Pacific Decadal Oscillation (PDO), and Atlantic Multidecadal Oscillation (AMO). The NDVI of grasslands, meadows and coniferous forests was significantly and positively correlated with precipitation, while the NDVI of alpine vegetation, swamps and shrubs was negatively and significantly correlated with precipitation in the UHRB. The NDVI of grasslands was significantly and positively correlated, but the NDVI of shrubs, coniferous forests and cultivated vegetation was negatively and significantly correlated with precipitation in the MHRB. The correlation between cultivated vegetation and natural precipitation in the MHRB may have been weakened by human activities. Article in Journal/Newspaper Arctic Climate change Directory of Open Access Journals: DOAJ Articles Arctic Kendall ENVELOPE(-59.828,-59.828,-63.497,-63.497) Pacific Water 11 7 1394 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
precipitation indices large-scale circulations NDVI Heihe River Basin Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 |
spellingShingle |
precipitation indices large-scale circulations NDVI Heihe River Basin Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 Fanglei Zhong Qingping Cheng Yinchun Ge Relationships between Spatial and Temporal Variations in Precipitation, Climatic Indices, and the Normalized Differential Vegetation Index in the Upper and Middle Reaches of the Heihe River Basin, Northwest China |
topic_facet |
precipitation indices large-scale circulations NDVI Heihe River Basin Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 |
description |
Changes in precipitation are critical indicators of climate change. In this study, the daily precipitation records from 10 meteorological stations in the Heihe River Basin, Northwest China from 1961−2016, precipitation indices, climate indices, and the normalized differential vegetation index (NDVI) were investigated using the Pearson, Kendall, and Spearman correlation coefficients; Theil-Sen Median; Mann−Kendall test; and wavelet coherence. The results indicated that the occurrences (fractional contributions) of 1−2-day wet periods were 81.3% (93.9%) and 55.3% (82.1%) in the upper (UHRB) and middle (MHRB) reaches of the Heihe River Basin, respectively. The spatial distribution of the occurrences (fractional contributions) was almost consistent with non-significant increases/decreases at stations. The ATP, ATD, API, and AMRD increased, while precipitation regimes suggest that dry seasons are getting wetter, and wet seasons are getting drier, although these changes were not significant. Wavelet coherence analyses showed that climate indices influenced precipitation, mainly its concentration, on a 4- to 78.6-month timescale. The Pearson, Kendall, and Spearman correlation coefficients showed weak lagged linkages between precipitation and the North Arctic Oscillation (NAO), Pacific Decadal Oscillation (PDO), and Atlantic Multidecadal Oscillation (AMO). The NDVI of grasslands, meadows and coniferous forests was significantly and positively correlated with precipitation, while the NDVI of alpine vegetation, swamps and shrubs was negatively and significantly correlated with precipitation in the UHRB. The NDVI of grasslands was significantly and positively correlated, but the NDVI of shrubs, coniferous forests and cultivated vegetation was negatively and significantly correlated with precipitation in the MHRB. The correlation between cultivated vegetation and natural precipitation in the MHRB may have been weakened by human activities. |
format |
Article in Journal/Newspaper |
author |
Fanglei Zhong Qingping Cheng Yinchun Ge |
author_facet |
Fanglei Zhong Qingping Cheng Yinchun Ge |
author_sort |
Fanglei Zhong |
title |
Relationships between Spatial and Temporal Variations in Precipitation, Climatic Indices, and the Normalized Differential Vegetation Index in the Upper and Middle Reaches of the Heihe River Basin, Northwest China |
title_short |
Relationships between Spatial and Temporal Variations in Precipitation, Climatic Indices, and the Normalized Differential Vegetation Index in the Upper and Middle Reaches of the Heihe River Basin, Northwest China |
title_full |
Relationships between Spatial and Temporal Variations in Precipitation, Climatic Indices, and the Normalized Differential Vegetation Index in the Upper and Middle Reaches of the Heihe River Basin, Northwest China |
title_fullStr |
Relationships between Spatial and Temporal Variations in Precipitation, Climatic Indices, and the Normalized Differential Vegetation Index in the Upper and Middle Reaches of the Heihe River Basin, Northwest China |
title_full_unstemmed |
Relationships between Spatial and Temporal Variations in Precipitation, Climatic Indices, and the Normalized Differential Vegetation Index in the Upper and Middle Reaches of the Heihe River Basin, Northwest China |
title_sort |
relationships between spatial and temporal variations in precipitation, climatic indices, and the normalized differential vegetation index in the upper and middle reaches of the heihe river basin, northwest china |
publisher |
MDPI AG |
publishDate |
2019 |
url |
https://doi.org/10.3390/w11071394 https://doaj.org/article/de19e3ae83644d8e8f56911e0bc3d84e |
long_lat |
ENVELOPE(-59.828,-59.828,-63.497,-63.497) |
geographic |
Arctic Kendall Pacific |
geographic_facet |
Arctic Kendall Pacific |
genre |
Arctic Climate change |
genre_facet |
Arctic Climate change |
op_source |
Water, Vol 11, Iss 7, p 1394 (2019) |
op_relation |
https://www.mdpi.com/2073-4441/11/7/1394 https://doaj.org/toc/2073-4441 2073-4441 doi:10.3390/w11071394 https://doaj.org/article/de19e3ae83644d8e8f56911e0bc3d84e |
op_doi |
https://doi.org/10.3390/w11071394 |
container_title |
Water |
container_volume |
11 |
container_issue |
7 |
container_start_page |
1394 |
_version_ |
1766345330936250368 |