Temporal Distribution Characteristics of Alpine Precipitation and Their Vertical Differentiation: A Case Study from the Upper Shule River

Qing-feng, LI; Gao, Yang

doi:10.3390/w9040284

Cited by 8 publications

(4 citation statements)

References 33 publications

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“…Trend detection was performed on the temporal dynamics of annual average temperature and annual precipitation. The least-square method was used to calculate the trend of changes in annual temperature and annual precipitation, with the slope of the fitting equation indicating the rate of changes, which was calculated as (Li and Yang 2017):…”

Section: Discussionmentioning

confidence: 99%

Spatially differentiated changes in regional climate and underlying drivers in southwestern China

2021

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The climate in Southwest China are predominantly under the influences of three contrasting climate systems, namely the East Asian monsoon, the South Asian monsoon, and the westerlies. However, it is unclear if the diversified climate systems, in combination with the complex terrain and varying vegetation types, would result in contrasting patterns of changes in climate across the region. Based on the CRU TS data for the period 1901−2017, we examined the spatiotemporal characteristics of the regional climate, and identified types of climate change patterns and drivers. Overall, the region experienced significant increases in annual mean temperature during 1901−2017, with occurrence of a significant turning point in 1954 for a more pronounced warming (0.16 °C/10 a). The annual precipitation fluctuated greatly over the study period without apparent trend, albeit the occurrence of a significant turning point in 1928 for a slight increase in the later period (1.19 mm/10 a). Spatially the multi-year averages of selective climate variables during 1901–2017 displayed a trend of decreases from southeast to northwest, but with increasing variability. We identified five major climate change types across the study region, including warmer (T+), drier (P−), warmer-drier (T+P−), warmer-wetter (T+P+), and no significant changes (NSC). The type T+P+ mainly occurred in the western parts over the plateau sub-frigid semiarid ecozone (77.0%) and the plateau sub-frigid semihumid ecozone (19.9%). The central parts of the region are characterized by the type T+, corresponding to six ecozones, including the mid-subtropical humid ecozone (33.1%), the plateau temperate humid-semihumid ecozone (28.8%), the plateau sub-rigid semihumid ecozone (9.5%), the southern subtropical humid ecozone (8.1%), the plateau sub-frigid arid ecozone (7.3%), and the plateau temperate semiarid ecozone (6.6%). No significant change in climate was detected for the eastern parts over the mid-subtropical humid ecozone (67.3%), the plateau temperate humid and semihumid ecozone (19.5%) and the plateau sub-frigid semihumid ecozone (8.8%). The types P− and T+P− together accounted for less than 5% of the entire study region, which predominantly occurred in central Yunnan-Guizhou Plateau and south of the southeastern Xizang, corresponding predominantly to the mid-subtropical humid ecozone. Across the region and within the zonal climate change types, vegetation and topography both played a significant role in determining the climate variability and magnitude of changes. Our results suggest that the southwestern China experienced intensified influences of the southeasterly monsoon and the southerly monsoon in the regional climate, while the westerly alpine influences subsided; topography and vegetation affected the magnitudes of the directional changes in climate at a local scale.

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Section: Discussionmentioning

confidence: 99%

Spatially differentiated changes in regional climate and underlying drivers in southwestern China

2021

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“…Pa is a good indicator of precipitation fluctuation, which is the percentage of the anomaly between the precipitation and the average precipitation in the same period (Yao et al, 2018), reflects the deviation and drought conditions of a period of abnormal precipitation (Li and Yang, 2017). As values above -0.5, -0.5 to -0.7, -0.7 to -0.85, -0.85 to -0.95, and below -0.95 represent none, mild, moderate, severe, and extreme drought, respectively.…”

Section: The Percentage Of Precipitation Anomaly (Pa)mentioning

confidence: 99%

Comparative Analysis on Responses of Vegetation Productivity Relative to Different Drought Monitor Patterns in Karst Regions of Southwestern China

Zhou¹,

Zhang²,

Wang³

et al. 2019

Appl. Ecol. Env. Res.

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“…Generally, precipitation in mountainous regions can be modulated by both local terrain characteristics and mesoscale geomorphology [7][8][9][10][11][12]. Complex orography is thought to control local precipitation patterns by determining the location and rate of upward air motion and triggering microphysical processes [13].…”

Section: Introductionmentioning

confidence: 99%

Orographic Effects of Geomorphology on Precipitation in a Pluvial Basin of the Eastern Tibetan Plateau

Yang

Zhang

2019

Water

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The eastern Tibetan Plateau is subjected to strong spatial variations in precipitation, but the underlying reasons are still not well understood due to sparse in-situ meteorological observations. In this study, streamflow observations were adopted to investigate the orographic controls on precipitation in the Qingyijiang (QYJ) Basin of the eastern Tibetan Plateau. The method of multi-year annual water balance was used to estimate the basin-level precipitation using in-situ streamflow and flux-based evapotranspiration. In addition, elevation transect was designed to examine the possible links between precipitation and geomorphology. The results showed the severe under-estimation of regional precipitation by weather sites (~1150 mm yr−1) in the QYJ Basin, where the runoff depth was as high as ~1450 mm yr−1. The water balance revealed a much higher level of precipitation (~2000 mm yr−1) in the QYJ Basin, but precipitation in the two adjacent basins was contrastingly low (<1000 mm yr−1). The spatial pattern of precipitation was well consistent with the local horn-mouth geomorphology, with more precipitation occurring in the geomorphologically converging and elevating region. Furthermore, within the the QYJ Basin, annual precipitation was larger in the sub-basins (>2200 mm) on or near the bottom of the horn-mouth geomorphology than the others (<1800 mm). With these results, we concluded that the high precipitation level in the QYJ Basin could be attributed to the combined converging and lifting effects of geomorphology on the westward atmospheric vapor. Therefore, flooding risk should be carefully accounted for in the basins with similar geomorphology in the eastern Tibetan Plateau.

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Temporal Distribution Characteristics of Alpine Precipitation and Their Vertical Differentiation: A Case Study from the Upper Shule River

Cited by 8 publications

References 33 publications

Spatially differentiated changes in regional climate and underlying drivers in southwestern China

Spatially differentiated changes in regional climate and underlying drivers in southwestern China

Comparative Analysis on Responses of Vegetation Productivity Relative to Different Drought Monitor Patterns in Karst Regions of Southwestern China

Orographic Effects of Geomorphology on Precipitation in a Pluvial Basin of the Eastern Tibetan Plateau

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