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3.2 Water vapor transport
Water vapor transport plays an important role in the
atmospheric water cycle. A convergence of abundant water
vapor flux generally favors precipitation and vice versa.
As shown in Fig. 4a, both the westerly water vapor
flux over North China and the southwesterly water vapor
flux over South China are projected to be enhanced by the
mid-21st century. In particular, the water vapor flux over
most parts of western and northeastern China increases by
more than 30%, while that over the Yangtze River basin
increases by less than 20% (not shown). The water vapor
transport over East Asia is largely influenced by the
mid-latitude westerlies and East Asian monsoon. Considering
this, the wind field at 850 hPa was contrasted between
the mid-21st century and 1981–2000 (figure not
shown, for brevity), and the results show no strong evidence
for enhanced mid-latitude westerlies. However, the
southwesterlies over SWC increase notably, implying a
considerable contribution of atmospheric circulation to
the strengthened southwesterly water vapor inflow. In
addition, it was found that there is a significant anticyclonic
change of the wind field over NEC. This change
may partly account for the increasing divergence of water
vapor flux over NEC, which implies less converged water
vapor for precipitation, consistent with the decrease of
precipitation over NEC by the mid-21st century. Although
the changes of water vapor flux divergence shown in Fig.
4a are fragmentary, mainly due to the high horizontal
resolution, it can be seen that most parts of NEC and the
Tibetan Plateau are featured with increasing divergences.

Answer 1

3.2 Water vapor transport
Water vapor transport plays an important role in the
atmospheric water cycle. A convergence of abundant water
vapor flux generally favors precipitation and vice versa.
As shown in Fig. 4a, both the westerly water vapor
flux over North China and the southwesterly water vapor
flux over South China are projected to be enhanced by the
mid-21st century. In particular, the water vapor flux over
most parts of western and northeastern China increases by
more than 30%, while that over the Yangtze River basin
increases by less than 20% (not shown). The water vapor
transport over East Asia is largely influenced by the
mid-latitude westerlies and East Asian monsoon. Considering
this, the wind field at 850 hPa was contrasted between
the mid-21st century and 1981–2000 (figure not
shown, for brevity), and the results show no strong evidence
for enhanced mid-latitude westerlies. However, the
southwesterlies over SWC increase notably, implying a
considerable contribution of atmospheric circulation to
the strengthened southwesterly water vapor inflow. In
addition, it was found that there is a significant anticyclonic
change of the wind field over NEC. This change
may partly account for the increasing divergence of water
vapor flux over NEC, which implies less converged water
vapor for precipitation, consistent with the decrease of
precipitation over NEC by the mid-21st century. Although
the changes of water vapor flux divergence shown in Fig.
4a are fragmentary, mainly due to the high horizontal
resolution, it can be seen that most parts of NEC and the
Tibetan Plateau are featured with increasing divergences.
3.2 水汽输送
水汽输送的重要作用
大气水循环。收敛性的充足的水源
水汽通量一般有利于降水，反之亦然。
这两个西风的水汽图 4a 所示
在中国北方和西南水汽通量
在华南的通量预计将由增强
21 世纪中叶。尤其是，水汽通量超过
中国西部和东北部大部分地区增加
超过 30%，而在长江流域
增加不超过 20%（未显示）。水蒸气
东亚地区运输很大程度上受
中纬度西风带和东亚夏季风环流。考虑到
这一点，在 850 hPa 风场之间进行了对比
1981 — — 2000 年和 21 世纪中叶 （不图
如所示，为简洁起见），结果表明没有有力证据
为增强中纬度西风带。然而，
在深港西部通道被削弱增加值得注意的是，这意味着
对大气环流的相当大的贡献
加强西南水汽流入。在
另外，它被发现是显著反气旋
NEC 风场的变化。这种变化
可部分地解释为水的日益分歧
水汽通量在 nec 公司，这意味着更少的融合的水
气相沉淀，符合的减少
21 世纪中叶由 NEC 的降水。虽然
图中所示的水汽通量散度的变化。
4a 是零碎的主要是由于高水平
决议，可以看到，大多数 NEC 的部分和
青藏高原具有增加分歧。来自：求助得到的回答

Answer 2

水蒸气运输
水蒸气运输在大气水循环中发挥着重要作用。丰富的水汽通量集聚通常易于沉淀,反之亦然。
如图4所示,直至21世纪中叶，在华北的西风水汽通量和在华南的西南水汽通量预计得到增强。特别是中国西部和东北部大部分地区的水汽通量增加超过30%,同时,在长江流域增加不到20%(没有显示)。东亚的水蒸气运输很大程度上受中纬度西风带和东亚季风的影响。考虑这一点,对比21世纪和1981 - 2000年的850 hPa风场(为确保简洁，数据未显示),结果显示没有强有力的证据证明中纬度西风带有所增强。然而,在SWC的西南风带明显增加,表明大气环流加强西南水汽流入有相当大的贡献。另外,在NEC风场发现有一个很明显的反气旋变化。这种变化在一定程度上可以解释在NEC水汽通量散度的增加,这意味着更少的水汽通量沉淀,与NEC在21世纪中叶降水减少相一致。虽然由于高水平分辨率，图4显示的水汽通量散度的变化是断断续续的,,但是还是可以看出NEC和青藏高原的大部分地区的水汽通量散度增加。