The Impact of Observed Vegetation Changes on Land-Atmosphere Feedbacks During Drought (SCI)
文献类型：期刊论文
| 作者 | Meng X. H. ; Evans J. P. ; McCabe M. F. |
| 刊名 | Journal of Hydrometeorology
 |
| 出版日期 | 2014 |
| 卷号 | 15期号:2页码:759-776 |
| 英文摘要 | Moderate Resolution Imaging Spectroradiometer (MODIS)-derived vegetation fraction data were used to update the boundary conditions of the advanced research Weather Research and Forecasting (WRF) Model to assess the influence of realistic vegetation cover on climate simulations in southeast Australia for the period 2000-08. Results show that modeled air temperature was improved when MODIS data were incorporated, while precipitation changes little with only a small decrease in the bias. Air temperature changes in different seasons reflect the variability of vegetation cover well, while precipitation changes have a more complicated relationship to changes in vegetation fraction. Both MODIS and climatology-based simulation experiments capture the overall precipitation changes, indicating that precipitation is dominated by the large-scale circulation, with local vegetation changes contributing variations around these.Simulated feedbacks between vegetation fraction, soil moisture, and drought over southeast Australia were also investigated. Results indicate that vegetation fraction changes lag precipitation reductions by 6-8 months in nonarid regions. With the onset of the 2002 drought, a potential fast physical mechanism was found to play a positive role in the soil moisture-precipitation feedback, while a slow biological mechanism provides a negative feedback in the soil moisture-precipitation interaction on a longer time scale. That is, in the short term, a reduction in soil moisture leads to a reduction in the convective potential and, hence, precipitation, further reducing the soil moisture. If low levels of soil moisture persist long enough, reductions in vegetation cover and vigor occur, reducing the evapotranspiration and thus reducing the soil moisture decreases and dampening the fast physical feedback. Importantly, it was observed that these feedbacks are both space and time dependent. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2015-12-24 |
| 源URL | [http://ir.casnw.net/handle/362004/24914]  |
| 专题 | 寒区旱区环境与工程研究所_中科院寒区旱区环境与工程研究所（未分类）_期刊论文 |
| 推荐引用方式 GB/T 7714 | Meng X. H.,Evans J. P.,McCabe M. F.. The Impact of Observed Vegetation Changes on Land-Atmosphere Feedbacks During Drought (SCI)[J]. Journal of Hydrometeorology,2014,15(2):759-776. |
| APA | Meng X. H.,Evans J. P.,&McCabe M. F..(2014).The Impact of Observed Vegetation Changes on Land-Atmosphere Feedbacks During Drought (SCI).Journal of Hydrometeorology,15(2),759-776. |
| MLA | Meng X. H.,et al."The Impact of Observed Vegetation Changes on Land-Atmosphere Feedbacks During Drought (SCI)".Journal of Hydrometeorology 15.2(2014):759-776. |
入库方式： OAI收割
来源：寒区旱区环境与工程研究所
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