Responses and feedbacks of vegetation dynamics to precipitation anomaly over the semiarid area of north China: Evidences from simulations of the WRF-Noah model,International Journal of Climatology

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Responses and feedbacks of vegetation dynamics to precipitation anomaly over the semiarid area of north China: Evidences from simulations of the WRF-Noah model
International Journal of Climatology ( IF 3.5 ) Pub Date : 2022-08-12 , DOI: 10.1002/joc.7830
Xuezhen Zhang _{1,

2} , Xinrui Liu _{1,

2} , Jiazhe Chen _{1,

2} , Qiuhong Tang _{1,

2} , Yilong Wang ₁

Affiliation

Knowledge of the responses and feedbacks of vegetation dynamics to interannual climate anomalies in the semiarid area of north China is lacking. This study addresses this issue through climate modelling for 1991–2006 with the Weather Research and Forecast (WRF) model, into which a locally empirical vegetation dynamic (VED) scheme was implemented. The VED scheme was built on the basis of regression models of the leaf area index (LAI), green vegetation fraction (GVF), and surface albedo (ALB) with ambient temperature and humidity as independent variables. Using the update WRF model, the climate simulations were carried out with turning on and off VED, respectively. By comparing the simulations outputs with each other, we find that the interannual variability of precipitation from simulations with turning on VED is larger than that from simulations with turning off VED. The larger interannual variability of precipitation could be explained by VED feedback. Vegetation growth would be more vigorous, as a response, under the more precipitation, because which brings more available water. In turn, vigorous vegetation leads to more evapotranspiration and, hence, precipitable water; as a result, there would be more precipitation. It is reversed for the years with less precipitation. Such interactions between vegetation and precipitation could be summarized as positive feedback loops. This study suggests that the interannual precipitation variability can be enlarged by VED through positive evapotranspiration–precipitation feedback. It is therefore necessary to consider the vegetation dynamics for future downscaled regional climate predictions to pursue more reliable interannual climate variability.

中文翻译：

华北半干旱地区植被动态对降水异常的响应与反馈——来自WRF-Noah模式模拟的证据

缺乏关于华北半干旱地区植被动态对年际气候异常的响应和反馈的知识。本研究通过使用天气研究和预报 (WRF) 模型的 1991-2006 年气候建模解决了这个问题，在该模型中实施了局部经验植被动态 (VED) 方案。VED 方案建立在以环境温度和湿度为自变量的叶面积指数 (LAI)、绿色植被分数 (GVF) 和地表反照率 (ALB) 的回归模型的基础上。使用更新的 WRF 模型，分别在打开和关闭 VED 的情况下进行气候模拟。通过相互比较模拟输出，我们发现开启VED模拟的降水年际变化大于关闭VED模拟的降水年际变化。VED 反馈可以解释较大的降水年际变化。作为响应，在更多的降水下，植被生长会更加旺盛，因为这会带来更多的可用水。反过来，生机勃勃的植被会导致更多的蒸发蒸腾，从而导致可降水；结果，会有更多的降水。与降水较少的年份相反。植被和降水之间的这种相互作用可以概括为正反馈循环。这项研究表明，VED 可以通过蒸散-降水正反馈来扩大年际降水变率。

更新日期：2022-08-12

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