干旱区研究 ›› 2023, Vol. 40 ›› Issue (9): 1404-1413.doi: 10.13866/j.azr.2023.09.04 cstr: 32277.14.j.azr.2023.09.04
王娜娜1(),韩磊1,2,3(),柳利利1,彭苓4,周鹏4,马云蕾1,马军4
收稿日期:
2023-03-14
修回日期:
2023-04-30
出版日期:
2023-09-15
发布日期:
2023-09-28
作者简介:
王娜娜(1998-),女,硕士研究生,主要研究方向为同位素水文学. E-mail: 基金资助:
WANG Nana1(),HAN Lei1,2,3(),LIU Lili1,PENG Ling4,ZHOU Peng4,Ma Yunlei1,Ma Jun4
Received:
2023-03-14
Revised:
2023-04-30
Published:
2023-09-15
Online:
2023-09-28
摘要:
全球气候变暖加速了区域水循环,改变了水汽的传输路径,了解不同等级降雨稳定同位素特征及水汽来源为水资源的利用及旱涝灾害的防治提供依据。基于2018—2020年夏半年(5—10月)采集的银川平原降雨样品,研究不同等级降雨中氢氧稳定同位素的变化特征及其二次蒸发效应,并利用后向轨迹模型及水汽通量等方法分析降雨的水汽来源及潜在蒸发源区。结果表明:银川平原夏半年不同等级降雨稳定同位素随着降雨等级的增加而偏负,小雨氘盈余(d-excess)值偏负而中雨和大雨偏正,大气降水线斜率和截距随着雨量级的增加呈现出递减的规律。二次蒸发作用的强弱随气温升高而增大,随降雨量、相对湿度和雨滴直径增大而减弱。西风水汽为银川平原夏半年降雨的主控水汽,同时小雨、中雨、大雨还分别受到陆地蒸发水汽、大西洋水汽及太平洋水汽的影响。潜在蒸发源区对小雨影响较大,主要位于研究区周边及北部、南部和东南部地区;中雨潜在蒸发源区主要分布在研究区周边地区及其西北部和东南部;大雨主要分布在研究区周边及东南部地区。
王娜娜,韩磊,柳利利,彭苓,周鹏,马云蕾,马军. 银川平原夏半年不同等级降雨水汽输送机制[J]. 干旱区研究, 2023, 40(9): 1404-1413.
WANG Nana,HAN Lei,LIU Lili,PENG Ling,ZHOU Peng,Ma Yunlei,Ma Jun. Water vapor transport mechanisms for varied precipitation grades during the summer half-year in Yinchuan Plain[J]. Arid Zone Research, 2023, 40(9): 1404-1413.
表2
大气温度、相对湿度、降雨和雨滴直径影响下的二次蒸发效应"
影响因子 | 变化范围 | f/% | δ18O/‰ | d-excess/‰ |
---|---|---|---|---|
大气温度/℃ | 0~10 | 93.19 | -4.64 | 3.14 |
10~15 | 88.33 | -4.46 | -2.14 | |
15~20 | 86.30 | -4.39 | -5.21 | |
20~30 | 91.80 | -6.58 | -1.39 | |
相对湿度/% | <60 | 82.42 | -2.96 | -6.38 |
60~70 | 88.81 | -4.22 | -6.14 | |
70~80 | 91.76 | -5.58 | 3.17 | |
80~90 | 95.80 | -7.04 | 9.04 | |
降雨量/mm | 0~2 | 85.33 | -3.79 | -6.98 |
2~5 | 91.47 | -3.95 | -1.98 | |
5~10 | 93.16 | -6.81 | 0.96 | |
雨滴直径/mm | 0.6~0.8 | 78.67 | -3.05 | -2.74 |
0.8~1.0 | 90.26 | -6.12 | -1.42 | |
1.0~1.2 | 94.10 | -5.03 | 4.41 | |
1.2~1.5 | 94.12 | -4.59 | -1.54 |
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