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Agriculture development-induced surface albedo changes and climatic implications across northeastern China

机译：中国东北地区农业发展引起的地表反照率变化及其气候影响

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摘要

To improve the understandings on regional climatic effects of past human-induced land cover changes, the surface albedo changes caused by conversions from natural vegetation to cropland were estimated across northeastern China over the last 300 years, and its climatic effects were simulated by using the Weather Research and Forecasting (WRF) model. Essential natural vegetation records compiled from historical documents and regional optimal surface albedo dataset were used. The results show that the surface albedo decreased by 0.01–0.03 due to conversions from grassland to cropland in the Northeast China Plain and it increased by 0.005–0.015 due to conversions from forests to cropland in the surrounding mountains. As a consequence, in the Northeast China Plain, the surface net radiation increased by 4–8 W/m2, 2–5 W/m2, and 1–3 W/m2, and the climate was therefore warmed by 0.1°C–0.2°C、0.1°C–0.2°C、 0.1°C–0.3° in the spring, autumn and winter, respectively. In the surrounding mountain area, the net radiation d °C ecreased by less than 1.5 W/m2, and the climate was therefore cooled too slight to be detected. In summer, effects of surface albedo changes on climate were closely associated with moisture dynamics, such as evapotranspiration and cloud, instead of being merely determined by surface radiation budget. The simulated summer climatic effects have large uncertainties. These findings demonstrate that surface albedo changes resulted in warming climate effects in the non-rainy seasons in Northeast China Plain through surface radiation processes while the climatic effects in summer could hardly be concluded so far.
机译：为了更好地了解过去人类造成的土地覆盖变化对区域气候影响的影响，我们估算了过去300年来中国东北地区由自然植被转变为农田引起的地表反照率变化，并使用天气模拟了其气候影响。研究和预测（WRF）模型。使用了由历史文献和区域最佳地表反照率数据集汇编而成的基本天然植被记录。结果表明，由于东北平原从草地向农田的转化，地表反照率降低了0.01-0.03，而由于周围山区从森林向农田的转化，地表反照率增加了0.005-0.015。结果，在东北平原，地表净辐射增加了4–8 W / m2 ，2–5 W / m2 和1–3 W / m2 ，因此，春季，秋季和冬季的气候分别升高了0.1°C–0.2°C，0.1°C–0.2°C，0.1°C–0.3°。在周围的山区，净辐射d°C上升了不到1.5 W / m2 ，因此气候被冷却得太微弱而无法检测到。在夏季，地表反照率变化对气候的影响与水分动力（例如蒸散和云）密切相关，而不仅仅是由地表辐射预算决定。模拟的夏季气候影响具有很大的不确定性。这些发现表明，地表反照率的变化通过地表辐射过程导致了东北平原非雨季的气候变暖效应，而到目前为止尚无法得出夏季的气候效应。

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  • 来源
    《Chinese Geographical Science》 |2012年第3期|p.264-277|共14页
  • 作者

    Xuezhen Zhang; Wei-Chyung Wang; Xiuqi Fang; Yu Ye; Jingyun Zheng;

  • 作者单位

    Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China;

    Atmospheric Sciences Research Center, State University of New York, Albany, NY, 12202, USA;

    School of Geography, Beijing Normal University, Beijing, 100875, China;

    School of Geography, Beijing Normal University, Beijing, 100875, China;

    Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China;

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  • 正文语种 eng
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  • 关键词

    surface albedo; land cover change; climatic effects; last 300 years; northeastern China;

    机译：地表反照率;土地覆盖变化;气候效应;近300年;中国东北;

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