Simulated Sea Ice Dataset for ESA Earth Explorer CryoRad

Files <code>20240408T004800</code><code>.nc</code>–<code>20240408T231225</code><code>.nc</code> contain geophysical fields and simulated brightness temperatures over the Arctic for the potential Earth Explorer 12 CryoRad mission configuration. Each file represents one full satellite orbit, timestamped by its midpoint time on April 8th 2024. Every orbit file includes nine microwave channels at 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, and 2.0 GHz, and covers a swath width of approximately 160 km.The geophysical variables comprise:sea‐ice thicknesssnow thicknesssnow temperatureair temperaturesea‐ice concentrationsea‐ice agesea‐ice temperaturesea‐ice salinityBrightness temperatures (TBs) were simulated using the Snow Microwave Radiative Transfer (SMRT) model configured with three snow layers over one sea-ice layer. All simulations use the same geophysical inputs, originally provided by the Danish Meteorological Institute (DMI). To ensure consistency in the dielectric modelling, all ice is simulated as first-year ice. After simulation, each variable (both geophysical and TB) was convolved to the footprint resolution of its respective channel, ensuring channel-consistent spatial representation. The original, unconvolved geophysical variables are included in each file with the suffix <code><strong>_orig</strong></code>.The accompanying GIF illustrates the temporal progression of Arctic coverage achieved by the provided sequence of orbits over a single day.<br><br>The dataset has been updated iteratively based on preliminary analysis. The versions are defined as follows:<br>v1: Original release using different dielectric models for first-year ice (FYI) and multiyear ice (MYI)<br>v2: Updated version using FYI dielectric models for both FYI and MYI<br>v3: Minor update with revised dataset attributes

文件<code>20240408T004800</code><code>.nc</code>至<code>20240408T231225</code><code>.nc</code>包含了针对潜在地球探索者12号（Earth Explorer 12）CryoRad任务构型的北极地区地球物理场与模拟亮温数据。每份文件对应一次完整的卫星轨道，以2024年4月8日的轨道中点时间作为时间戳。

每份轨道文件包含9个微波通道，频率分别为0.4、0.6、0.8、1.0、1.2、1.4、1.6、1.8及2.0 GHz，覆盖扫描幅宽约160 km。所涵盖的地球物理变量包括：海冰厚度、积雪厚度、积雪温度、气温、海冰密集度、海冰龄、海冰温度、海冰盐度。

亮温（Brightness Temperatures, TBs）采用积雪微波辐射传输（Snow Microwave Radiative Transfer, SMRT）模型模拟，该模型构型为1层海冰上方叠加3层积雪。所有模拟均采用统一的地球物理输入数据，初始数据由丹麦气象研究所（Danish Meteorological Institute, DMI）提供。为确保介电模拟的一致性，所有海冰均按一年冰（first-year ice, FYI）进行模拟。

模拟完成后，所有变量（包括地球物理场与亮温）均被卷积至对应通道的足迹分辨率，以保证各通道间空间表征的一致性。每份文件中还附带了未经过卷积处理的原始地球物理变量，其文件名后缀为<code><strong>_orig</strong></code>。

附带的GIF文件展示了本次提供的单日轨道序列对北极地区的覆盖时序变化。

本数据集已基于初步分析结果进行多次迭代更新，版本定义如下：
v1：初始发布版本，针对一年冰（first-year ice, FYI）和多年冰（multiyear ice, MYI）采用了不同的介电模型
v2：更新版本，对一年冰与多年冰均采用一年冰介电模型
v3：小幅更新版本，修正了数据集属性信息