CAJ | 학술논문

WRF 模式气候态植被覆盖度 GVF 数据集的制作源于卫星遥感资料，由于制作时间较早代表性逐渐变差，最新的MODIS 遥感产品可用于 WRF 模式下垫面数据集的更新。本文利用2013年 MODIS 卫星遥感产品反演的植被覆盖度更新WRF 模式默认的气候态数据集，进一步利用 WRF 模式计算与 GVF 相关的地表参数，并与 WRF 模式默认数据进行对比。结果表明：利用 MODIS 更新后的 GVF 在2013年不同季节均较 WRF 模式默认的气候态 GVF 偏高，尤其是中国南方和东北地区表现的“更绿”；MODIS 制作 GVF 的原数据空间分辨率为1 km，较 WRF 模式默认数据集的分辨率更高，适合高分辨率中尺度模式下垫面数据集的更新，更新后的 GVF 数据更细致，尤其是夏季城市下垫面 GVF 较周围偏低非常明显；通过分析 GVF 变化引起的叶面积指数、地表反照率和地表发射率的变化可知，农作物植被类型叶面积指数的变化最显著。东北地区森林覆盖虽较广，但由于森林的叶面积指数年季变化相对较小，叶面积指数增量并没有农作物的明显。地表反照率和地表发射率也与 WRF模式默认值有一定的差异。通过对比可见，更新后的 GVF 对 WRF 模式下垫面描述有一定的影响，需进一步开展季节尺度的模拟试验，对比植被覆盖度的变化对 WRF 模式模拟的影响。
WRF 모식기후태식피복개도 GVF 수거집적제작원우위성요감자료，유우제작시간교조대표성축점변차，최신적MODIS 요감산품가용우 WRF 모식하점면수거집적경신。본문이용2013년 MODIS 위성요감산품반연적식피복개도경신WRF 모식묵인적기후태수거집，진일보이용 WRF 모식계산여 GVF 상관적지표삼수，병여 WRF 모식묵인수거진행대비。결과표명：이용 MODIS 경신후적 GVF 재2013년불동계절균교 WRF 모식묵인적기후태 GVF 편고，우기시중국남방화동북지구표현적“경록”；MODIS 제작 GVF 적원수거공간분변솔위1 km，교 WRF 모식묵인수거집적분변솔경고，괄합고분변솔중척도모식하점면수거집적경신，경신후적 GVF 수거경세치，우기시하계성시하점면 GVF 교주위편저비상명현；통과분석 GVF 변화인기적협면적지수、지표반조솔화지표발사솔적변화가지，농작물식피류형협면적지수적변화최현저。동북지구삼림복개수교엄，단유우삼림적협면적지수년계변화상대교소，협면적지수증량병몰유농작물적명현。지표반조솔화지표발사솔야여 WRF모식묵인치유일정적차이。통과대비가견，경신후적 GVF 대 WRF 모식하점면묘술유일정적영향，수진일보개전계절척도적모의시험，대비식피복개도적변화대 WRF 모식모의적영향。
The data sets of fraction of green vegetation coverage estimated by remote sensing and used in WRF (Weather Research and Forecasting Model),was produced many years ago,and its representation is gradually de-teriorating.The latest MODIS (Moderate Resolution Imaging Spectroradiometer)products can be used to update the data sets in WRF.In this work,the green vegetation coverage fraction estimated using the MODIS products was compared with the default data sets in WRF along with the other relevant parameters.The results show that the green vegetation coverage fraction estimated by MODIS products is higher than that of default,especially in the south and northeast of China.Because of its high resolution of MODIS production,it is very suitable to estimate the underlying surface data sets in Numerical Weather Prediction (NWP).Green vegetation coverage fraction in urban is significant lower than in non-urban area at summer.Analysis of increment of leaf area index,surface albedo and surface emission by update green vegetation coverage fraction suggests that leaf area index increment of crop is the largest among all vegetation.Although forest coverage is large in the northeast China,its annual and seasonal varia-tion of leaf area index is relatively small,and its increment is not as lager as that of crop.Thus,surface albedo and emission have a certain difference compared with default by the WRF.In all,green vegetation coverage fraction has a propounding influence in NWP,and some simulation work such as seasonal simulation should be carried out to evaluate the influence results in NWP.