CAJ | 학술논문

利用1650～1750年逐年变化的太阳辐照度等外强迫资料,驱动中国科学院大气物理研究所LASG发展的快速气候系统模式FGOALS_gl,模拟了小冰期(LIA)气候.把模拟的LIA表面温度变化与重建资料进行对比,结果表明FGOALS_gl对LIA气候具有较强的模拟能力,说明太阳辐照度的自然变化是导致小冰期气候的重要成因.模拟结果显示,LIA时期纬向平均温度变化表现为整个对流层降温,低纬度地Ⅸ的降温中心位于对流层中层,北半球降温幅度大于南半球,高纬地区的降温幅度大于低纬地区.分析发现,中高纬地区的局地温度变化主要与环流异常相对应的冷暖平流有关;低纬地区的降温主要与赤道东风加强有关,东风增强通过增大蒸发和引起次表层冷海水上翻而令表层温度降低.LIA时期的降水变化丰要位于中低纬地区,表现为日界线东(西)侧降水的负(正)异常.与降水异常相对应.Walker环流加强,东太平洋对流活动减弱,它与低纬地区对流层中层冷异常相联系.与大气层顶净短波辐射异常的季节变化相对应,南、北半球夏季平均表面温度异常较之冬季低0.28℃左右.
이용1650～1750년축년변화적태양복조도등외강박자료,구동중국과학원대기물리연구소LASG발전적쾌속기후계통모식FGOALS_gl,모의료소빙기(LIA)기후.파모의적LIA표면온도변화여중건자료진행대비,결과표명FGOALS_gl대LIA기후구유교강적모의능력,설명태양복조도적자연변화시도치소빙기기후적중요성인.모의결과현시,LIA시기위향평균온도변화표현위정개대류층강온,저위도지Ⅸ적강온중심위우대류층중층,북반구강온폭도대우남반구,고위지구적강온폭도대우저위지구.분석발현,중고위지구적국지온도변화주요여배류이상상대응적랭난평류유관;저위지구적강온주요여적도동풍가강유관,동풍증강통과증대증발화인기차표층랭해수상번이령표층온도강저.LIA시기적강수변화봉요위우중저위지구,표현위일계선동(서)측강수적부(정)이상.여강수이상상대응.Walker배류가강,동태평양대류활동감약,타여저위지구대류층중층랭이상상련계.여대기층정정단파복사이상적계절변화상대응,남、북반구하계평균표면온도이상교지동계저0.28℃좌우.
The LASG/IAP climate system model FGOALS_gl was run under transient external forcings from 1650A. D. To 1750A. D. To simulate the Little Ice Age (LIA)climate. Compared with the reconstruction data, the climate anomalies of LIA are reasonably reproduced by FGOALS_gl, demonstrating the dominant role of natural solar irradiance changes in resulting in the LIA climate. The cooling during the LIA penetrates throughout the troposphere and exhibits the maximum value in mid-troposphere at low latitudes. For surface air temperature, the cooling in the Northern Hemisphere is stronger than that in the Southern Hemisphere and is stronger at high latitudes than at low latitudes. Anomalous atmospheric circulation contributes to explain the regional surface air temperature anomalies in mid-high latitudes. In the tropical area, an intensified easterly is obtained in the model response which is consistent with a Southern-Oscillation-like structure in sea-level pressure. The enhanced easterly leads to a cooler sea surface temperature through intensified evaporation and upwelling of sub-surface cold water. The precipitation shows positive(negative) anomalies in the western (eastern)tropical Pacific. Associated with the precipitation anomalies, an intensified Walker circulation is simulated in the Eastern Pacific with suppressed convection. For both northern and southern hemispheres,the surface cooling is about 0.28℃ stronger in summer than in winter, which is consistent with the seasonal evolution of the net solar radiation changes at the top of atmosphere.