不同的土地利用不但會影響地表的能量收支，也會影響大氣和地表的交互作用，因此對區域天氣有顯著的影響，本論文主要在探討使用不同土地利用資料對於午後熱對流的模擬有何影響，影響的因素為何?並且針對台北地區做討論，論文中將使用三種土地利用資料，分別為U.S. Geological Survey(USGS)、Moderate Resolution Image Spectroradiometer(MODIS)以及NCU，這三種土地利用資料彼此有相當顯著的差異，MODIS在分類為都市的面積較其他兩者多，而NCU介於中間， USGS則是三者中分類為都市的面積最少的，整體上幾乎沒有都市分布，土地利用型態主要為灌溉地。

在溫度模擬上，MODIS白天高溫區的分布最廣，由於MODIS中分類為都市的面積最廣，因此使得模擬的溫度較高，海陸溫差也最大導致海陸溫度梯度最大，於是模擬的海陸風強度也最強，NCU則是介於兩者之間，USGS分類為都市區域的面積相當少，因此模擬的溫度是三者中最低的，導致其模擬的海陸風強度最弱，由於三者海陸風之間的差異，對於水氣輸送通量也有影響，MODIS模擬的海陸風最強，因此其水氣輸送通量也較大，從外海輸送至台北盆地的水氣最多，NCU次之，而USGS最小，溫度模擬上的差異不僅反應在海陸風上，如同海陸風結果一樣，在台北盆地的上升運動MODIS最強烈，NCU次之，USGS最小，綜合上述因素，使得三者降雨的模擬產生差異。
敏感度實驗分成地形高度和人工熱源兩個部分，地形高度部分是將陽明山地形移除，移除後發現三種土地利用資料的模擬結果都呈現類似的趨勢，台北盆地的風向從原本的西北風和東北風交匯，變成偏北風，主要是失去地形阻擋，導致北風更加深入台北盆地，使得水氣輸送更加順暢造成降雨增多。而人工熱源部分是開啟Urban canopy model將人工熱源設定為200〖w/m〗^2和400〖w/m〗^2。其中，將人工熱源提升後，MODIS和NCU受到顯著的影響，USGS則是沒有顯著的影響，這是由於人工熱源主要作用在都市，而MODIS和NCU整體分類為都市的面積較多，因此受到的影響較顯著，USGS則是分類為都市的面積較少，因此沒有顯著的影響。

Different landuse datas not only affect the land surface energybudget, but also have a significant effect on regional weather simulation.This study will explore how different land usage has an effect on regional
weather simulation. There are three kinds of landuse data — U.S.Geological Survey(USGS), Moderate Resolution Image
Spectroradiometer (MODIS), and NCU. There are obvious differences between this three kinds of landuse data. MODIS’s urban area is much larger than the other two, mostly in the north, west coast, and southwest of
Taiwan. NCU is basically in Taipei, I-Lan, west, and southwest. There are nearly non-urban areas in USGS, the main category is irrigated land.
In the temperature simulation, the MODIS area of high temperature is the largest, because the urban area of MODIS is the largest. The biggest
temperature difference of ocean and land leads to the steep gradients, so land-sea breeze is strongest. The temperature of USGS is lowest because it is lack of urban areas, so the land-sea breeze is the mildest. As a result, the strongest wind of MODIS transports the most vapor to the Taipei Basin. NCU is the second, and USGS is the least. As the strongest land-sea breeze, the ascending motiom of MODIS in the Taipei Basin is the most intense. NCU is second, and USGS is the mildest. With all factors, these three afternoon convections simulation are different.
The sensitivity experiment is divided into two parts, terrain height and antropogenic heaeting. When remove Yangming mointain, the wind field simulations with three landuse datas have same trend. Without terrain
block, wind direction change from northeast and northwest to north. Because that, north wind bring more moisture to Taipei area and cause heavy rain. When turn on urban canopy model, set antropogenic heating at
200w/m2 and 400w/m2. MODIS and NCU have significant influence, but USGS does not.Because antropogenic heating work on urban area. USGS are lack of urban area, so it doesn’t have significant influence.

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