| 项目编号: | NE/H008187/1
|
| 项目名称: | Snow-Vegetation-Atmosphere Interactions over Heterogeneous Landscapes |
| 作者: | Richard Lawrence Essery
|
| 承担单位: | University of Edinburgh
|
| 批准年: | 2009
|
| 开始日期: | 2010-01-11
|
| 结束日期: | 2014-28-02
|
| 资助金额: | GBP324216
|
| 资助来源: | UK-NERC
|
| 项目类别: | Research Grant
|
| 国家: | UK
|
| 语种: | 英语
|
| 特色学科分类: | Atmospheric phys. & chemistry 
; (40%)
; Climate & Climate Change 
; (20%)
; Geosciences 
; (30%)
; Marine environments 
; (10%)
|
| 英文摘要: | By modifying the amount of solar radiation absorbed at the land surface, bright snow and dark forests have strong influences on weather and climate; either a decrease in snow cover or an increase in forest cover, which shades underlying snow, increases the absorption of radiation and warms the overlying air. Computer models for weather forecasting and climate prediction thus have to take these effects into account by calculating the changing mass of snow on the ground and interactions of radiation with forest canopies. Such models generally have coarse resolutions ranging from kilometres to hundreds of kilometres. Forest cover cannot be expected to be continuous over such large distances; instead, northern landscapes are mosaics of evergreen and deciduous forests, clearings, bogs and lakes. Snow can be removed from open areas by wind, shaded by surrounding vegetation or sublimated from forest canopies without ever reaching the ground, and these processes which influence patterns of snow cover depend on the size of the openings, the structure of the vegetation and weather conditions. Snow itself influences patterns of vegetation cover by supplying water, insulating plants and soil from cold winter temperatures and storing nutrients. The aim of this project is to develop better methods for representing interactions between snow, vegetation and the atmosphere in models that, for practical applications, cannot resolve important scales in the patterns of these interactions. We will gather information on distributions of snow, vegetation and radiation during two field experiments at sites in the arctic: one in Sweden and the other in Finland. These sites have been chosen because they have long records of weather and snow conditions, easy access, good maps of vegetation cover from satellites and aircraft and landscapes ranging from sparse deciduous forests to dense coniferous forests that are typical of much larger areas. Using 28 radiometers, and moving them several times during the course of each experiment, will allow us to measure the highly variable patterns of radiation at the snow surface in forests. Information from the field experiments will be used in developing and testing a range of models. To reach the scales of interest, we will begin with a model that explicitly resolves individual trees and work up through models with progressively coarser resolutions, testing the models at each stage against each other and in comparison with observations. The ultimate objective is a model that will be better able to make use of landscape information in predicting the absorption of radiation at the surface and the accumulation and melt of snow. We will work in close consultation with project partners at climate modelling and forecasting centres to ensure that our activities are directed towards outcomes that will meet their requirements. |
| 资源类型: | 项目
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/103803
|
| Appears in Collections: | 科学计划与规划
气候变化与战略
|
|
There are no files associated with this item.
|
|
作者单位: | University of Edinburgh
|
| Recommended Citation: | |
Richard Lawrence Essery. Snow-Vegetation-Atmosphere Interactions over Heterogeneous Landscapes. 2009-01-01.
|
|
|