2000－2021年青藏高原地区地表净辐射的时空变化

崔玉祥; 胡斯勒图; 李同文; 姬大彬; 张颢; 施建成

doi:10.11728/cjss2023.06.2023-0080

2000－2021年青藏高原地区地表净辐射的时空变化

doi: 10.11728/cjss2023.06.2023-0080 cstr: 32142.14.cjss2023.06.2023-0080

1.
中国科学院空天信息创新研究院　北京　100094
2.
中山大学测绘科学与技术学院　珠海　519080
3.
中国科学院国家空间科学中心　北京　100190

基金项目: 国家自然科学基金项目（42025504）和第二次青藏高原综合科学考察研究项目（2019 QZKK0206）共同资助

详细信息

作者简介:

崔玉祥：E-mail：cuiyuxiang23@mails.ucas.ac.cn

中图分类号: P4
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出版历程
- 收稿日期: 2023-08-03
- 修回日期: 2023-11-01
- 网络出版日期: 2023-12-07

Spatio-temporal Changes in Surface Net Radiation in the Qinghai-Tibet Plateau from 2000 to 2021

1.
Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094
2.
School of Geospatial Engineering and Science, Sun Yat-sen University, Zhuhai 519080
3.
National Space Science Center, Chinese Academy of Sciences, Beijing 100190

摘要

摘要: 基于CERES卫星提供的2000年3月至2022年2月SYN1 deg–Level 3辐射数据，结合Theil-Sen Median趋势分析、Mann-Kendall检验以及EOF分析等方法，分析了22年间青藏高原地表净辐射的时空变化规律。研究发现，在空间分布特征上，青藏高原地表净辐射总体呈现南高北低的分布特征，地表净辐射变化趋势具有高度一致性，但在青藏高原南部地表净辐射变化量级远高于青藏高原北部；在时间演化特征上，地表净辐射呈现准正弦振动，年周期变化明显，特别是2016－2017年出现突变，下降约5.52 W·m^–2，同期云覆盖度年平均值提高约18.75%。
- 青藏高原 /
- 地表净辐射 /
- 时空变化 /
- EOF分析 /
- Theil-Sen Median趋势 /
- Mann-Kendall检验
Abstract: Based on the SYN1 deg-Level 3 radiation product from the CERES satellite spanning from March 2000 to February 2022, The Theil-Sen Median trend analysis, Mann-Kendall test, and EOF analysis were combined to investigate the spatiotemporal patterns of surface net radiation on the Qinghai-Tibet Plateau over the past 22 years. The study found that in terms of spatial distribution characteristics, the surface net radiation in the Qinghai-Tibet Plateau exhibits a general pattern of higher values in the southern region and lower values in the northern region. The variation trend of surface net radiation shows a high degree of consistency, but the fluctuation amplitude of it in the southern region of the Qinghai-Tibet Plateau is much higher than that in the northern region of the Qinghai-Tibet Plateau. Regarding to the temporal evolution, the surface net radiation displayed quasi-sinusoidal oscillations with a noticeable annual periodicity. Notably, there was a sudden decrease of approximately 5.52 W·m^–2 in the period from 2016 to 2017. Concurrently, there was an increase of about 18.75% in the cloud area fraction during the same period.
- Qinghai-Tibet Plateau /
- Surface net radiation /
- Spatiotemporal change /
- EOF analysis /
- Theil-Sen Median trend /
- Mann-Kendall test
注释:

1) 1https://cstr.cn/18406.11.Geogra.tpdc.270099

2) 2https://ceres.larc.nasa.gov/data/

3) 3http://data.cma.cn/

HTML全文

图 1 青藏高原地区高程及地基站点分布

Figure 1. Elevation map of Qinghai-Tibet Plateau

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图 2 拉萨（a）、西宁（b）、那曲（c）、昌都（d）和玉树（e）站点CERES地表下行短波辐射和地基站点数据验证

Figure 2. Validation of CERES surface downward shortwave radiation data with ground-based station data at sites in Lhasa (a), Xining (b), Naqu (c), Changdu (d) and Yushu (e)

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图 3 2000－2021年青藏高原地区年平均地表净辐射空间分布

Figure 3. Spatial distribution of surface net radiation in the Qinghai-Tibet Plateau region from 2000 to 2021

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图 4 2000－2021年青藏高原地区地表净辐射变化分布

Figure 4. Distribution of surface net radiation changes in the Qinghai-Tibet Plateau region from 2000 to 2021

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图 5 2000－2021年青藏高原地区地表辐射各分量地表上行短波辐射（a）、地表下行短波辐射（b）、地表上行长波辐射（c）和地表下行长波辐射（d）变化分布

Figure 5. Distribution of changes in surface radiation components in the Qinghai-Tibet Plateau region from 2000 to 2021, including surface upward shortwave radiation (a), surface downward shortwave radiation (b), surface upward longwave radiation (c), and surface downward longwave radiation (d)

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图 6 2000－2021年青藏高原地区地表净辐射季节趋势（a）、地表净辐射年均变化趋势（b）和云覆盖面积分数变化趋势（c）

Figure 6. Seasonal trends (a), annual changes (b), and trends in cloud area fraction (c) for surface net radiation in the Qinghai-Tibet Plateau region from 2000 to 2021

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图 7 2000－2021年青藏高原地区地表净辐射第1模态（a）特征向量分布及对应月时间分布（b），第2模态（c）特征向量分布及对应月时间分布（d）

Figure 7. Distribution of the first mode (a) and corresponding monthly time distribution (b) of surface net radiation, distribution of the second mode (c) and corresponding monthly time distribution (d) in the Qinghai-Tibet Plateau region from 2000 to 2021

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表 1 青藏高原地区拉萨、西宁、那曲、昌都和玉树5个地基站点参数

Table 1. Parameters of five ground stations in Qinghai-Tibet Plateau region, including Lhasa, Xining, Naqu, Changdu and Yushu

地基站点名称	经度（E）/（°）	纬度（N） /（°）	海拔/m
拉萨（55591）	91.13	29.67	3648
西宁（58866）	101.75	36.72	2295
那曲（55299）	92.07	31.48	4507
昌都（56137）	97.17	31.15	3306
玉树（56029）	97.02	33.02	3681

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表 2 地表净辐射变化特征划分标准

Table 2. Criteria for classifying changes in surface net radiation

趋势（S）	显著水平（Z值）	趋势特征
$ S > 0 $	$ \left\|Z\right\|\ge 2.58 $	显著增加
	$ 1.96 < \left\|Z\right\| < 2.58 $	不显著增加
	$ \left\|Z\right\|\le 1.96 $	稳定不变
$ S=0 $	$ \left\|Z\right\| $	稳定不变
$ S < 0 $	$ \left\|Z\right\|\le 1.96 $	稳定不变
	$ 1.96 < \left\|Z\right\| < 2.58 $	不显著减少
	$ \left\|Z\right\|\ge 2.58 $	显著减少

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表 3 青藏高原地区地表净辐射时空场EOF分解前5个模态特征值与方差贡献率

Table 3. Characteristic values and variances contribution rate of the first five EOF modes for the spatial-temporal pattern of surface net radiation in the Qinghai-Tibet Plateau region

特征向量	特征根	方差贡献率/(%)	累积方差贡献率/(%)	特征根误差下限	特征根误差上限
1	591207.56	75.55	75.55	539749.55	642665.58
2	59337.21	7.58	83.13	54172.57	64501.85
3	34403.61	4.40	87.53	31409.16	37398.06
4	14341.27	1.83	89.36	13093.02	15589.52
5	11292.01	1.44	90.80	10309.16	12274.85

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