Mars Orbiter Camera observations of the Martian south polar cap in 1999–2000
Mars Orbiter Camera observations of the Martian south polar cap in 1999–2000
复制标题
1999-2000 年火星轨道飞行器相机对火星南极冠的观测
DOI：
10.1029/2000je001313
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
S. Davis
中科院分区：
文献类型：
--
作者：
P. James;B. Cantor;S. Davis
1999-2000年火星南极冠的春夏退缩已使用火星全球探测者号火星轨道飞行器相机实验的广角相机进行了研究。 1999-2000年的衰退与维京轨道飞行器在1977年观察到的衰退非常相似。尽管衰退的速度非常相似，但当前的衰退比1977年整个春季的衰退略早。记录显示，在 LS = 198° 和 223° 之间的南帽区域，黑暗地形的快速发展，被休·基弗 (Hugh Kieffer) 称为“神秘地形”。米切尔山脉的出现和分离也被详细记录，最终在夏至时完全消失。 2000年的剩余上限与1977年几乎相同；这一观察并没有解决1972年残留盖的外观截然不同的谜团。残留盖区域和明亮的季节性霜冻中的反照率在夏至前后迅速增加到高值，然后趋于平稳，直到季节性霜冻消失。需要对更多的火星年进行观测，以限制年际变化的程度及其与沙尘暴等其他现象的关系。
The spring-summer recession of the south polar cap of Mars in 1999–2000 has been investigated using the wide-angle cameras of the Mars Orbiter Camera experiment on Mars Global Surveyor. The 1999–2000 regression closely resembles the recession observed by Viking orbiters in 1977. Although the rates of recession are quite similar, the current recession was slightly ahead of that in 1977 throughout spring. The rapid development of dark terrain, dubbed “cryptic terrain” by Hugh Kieffer, in one sector of the south cap between LS = 198° and 223° is documented. The emergence and separation of the Mountains of Mitchel has also been recorded in detail, culminating with its complete disappearance at solstice. The 2000 residual cap is almost identical to that in 1977; this observation does not resolve the mystery of the very different appearance of the residual cap in 1972. The albedos in the residual cap region and in bright, seasonal frost increase rapidly to high values at around solstice and then level out until the seasonal frost disappears. Observations of more Martian years will be needed to constrain the amount of interannual variability and its relation to other phenomena such as dust storms.