Dataset for "The future sea-level contribution of the Greenland ice sheet: a multi-model ensemble study of ISMIP6"

This data set provides processed model output of ISMIP6 Greenland projections as documented and analysed in the following publication: Heiko Goelzer, Sophie Nowicki, Anthony Payne, Eric Larour, Helene Seroussi, William H. Lipscomb, Jonathan Gregory, Ayako Abe-Ouchi, Andy Shepherd, Erika Simon, Cecile Agosta, Patrick Alexander, Andy Aschwanden, Alice Barthel, Reinhard Calov, Christopher Chambers, Youngmin Choi, Joshua Cuzzone, Christophe Dumas, Tamsin Edwards, Denis Felikson, Xavier Fettweis, Nicholas R. Golledge, Ralf Greve, Angelika Humbert, Philippe Huybrechts, Sebastien Le clec'h, Victoria Lee, Gunter Leguy, Chris Little, Daniel P. Lowry, Mathieu Morlighem, Isabel Nias, Aurelien Quiquet, Martin Rückamp, Nicole-Jeanne Schlegel, Donald Slater, Robin Smith, Fiamma Straneo, Lev Tarasov, Roderik van de Wal, and Michiel van den Broeke: The future sea-level contribution of the Greenland ice sheet: a multi-model ensemble study of ISMIP6 , The Cryosphere, 2020. doi:10.5194/tc-2019-319 About the data: - The results are based on model output regridded conservatively to a 5x5 km regular ISMIP6 grid unless this is already the native grid. - The results are calculated over the ice-covered area of Greenland, map projection error corrected, ice sheet model specific densities taken into account. - The contribution of peripheral glaciers and ice caps has been removed, by considering their area-coverage in each grid cell. - The results for the projections 'exp*' are all calculated as differences to the control experiment ctrl_proj (suffix cr in filename for control removed). - Results for ctrl_proj and historical are un-corrected (no suffix cr in filename). Directory structure: versionid groupname1 modelname1 expid scalars_mm_cr_GIS_groupname1_modelname1_expid.nc scalars_rm_cr_GIS_groupname1_modelname1_expid.nc scalars_zm_cr_GIS_groupname1_modelname1_expid.nc ... Variables per file: scalars_mm_cr_GIS ----------------- Greenland wide numbers oarea - assumed ocean area [m2] rhof - model specific freshwater density [kg m-3] rhoi - model specific ice density [kg m-3] rhow - model specific ocean water density [kg m-3] time - time, typically in days since X iarea - Fraction of grid cell covered by land ice [1] iareagr - Fraction of grid cell covered by grounded ice sheet iareafl - Fraction of grid cell covered by ice sheet flowing over seawater ivol - ice volume [m3] ivolgr - grounded ice volume [m3] ivolfl - floating ice volume [m3] ivaf - ice volume above flotation [m3] lim - ice mass [kg] limgr - grounded ice mass [kg] limfl - floating ice mass [kg] limaf - ice mass above flotation [kg] sle - sea-level equivalent mass [m] !! decreases with mass loss !! smb - spatially integrated surface mass balance anomaly [kg s-1] scalars_rm_cr_GIS ----------------- IMBIE2-Rignot basins xx=[no,ne,se,sw,cw,nw] oarea - assumed ocean area [m2] rhof - model specific freshwater density [kg m-3] rhoi - model specific ice density [kg m-3] rhow - model specific ocean water density [kg m-3] time - time, typically in days since X ivaf_xx - ice volume above flotation [m3] smb_xx - spatially integrated surface mass balance anomaly [kg s-1] limaf_xx - ice mass above flotation [kg] sle_xx - sea-level equivalent mass [m] !! decreases with mass loss !! scalars_zm_cr_GIS ----------------- IMBIE2-Zwally basins xx=[z11,z12,z13,z14,z21,z22,z31,z32,z33,z41,z42,z43,z50,z61,z62,z71,z72,z81,z82] oarea - assumed ocean area [m2] rhof - model specific freshwater density [kg m-3] rhoi - model specific ice density [kg m-3] rhow - model specific ocean water density [kg m-3] time - time, typically in days since X ivaf_xx - ice volume above flotation [m3] smb_xx - spatially integrated surface mass balance anomaly [kg s-1] limaf_xx - ice mass above flotation [kg] sle_xx - sea-level equivalent mass [m] !! decreases with mass loss !! Data usage notice: If you use any of these results, please acknowledge the work of the people involved in producing them. Acknowledgements should have language similar to the below. “We thank the Climate and Cryosphere (CliC) effort, which provided support for ISMIP6 through sponsoring of workshops, hosting the ISMIP6 website and wiki, and promoted ISMIP6. We acknowledge the World Climate Research Programme, which, through it's Working Group on Coupled Modelling, coordinated and promoted CMIP5 and CMIP6. We thank the climate modeling groups for producing and making available their model output, the Earth System Grid Federation (ESGF) for archiving the CMIP data and providing access, the University at Buffalo for ISMIP6 data distribution and upload, and the multiple funding agencies who support CMIP5 and CMIP6 and ESGF. We thank the ISMIP6 steering committee, the ISMIP6 model selection group and ISMIP6 dataset preparation group for their continuous engagement in defining ISMIP6." You should also refer to and cite the following papers: Heiko Goelzer, Sophie Nowicki, Anthony Payne, Eric Larour, Helene Seroussi, William H. Lipscomb, Jonathan Gregory, Ayako Abe-Ouchi, Andy Shepherd, Erika Simon, Cecile Agosta, Patrick Alexander, Andy Aschwanden, Alice Barthel, Reinhard Calov, Christopher Chambers, Youngmin Choi, Joshua Cuzzone, Christophe Dumas, Tamsin Edwards, Denis Felikson, Xavier Fettweis, Nicholas R. Golledge, Ralf Greve, Angelika Humbert, Philippe Huybrechts, Sebastien Le clec'h, Victoria Lee, Gunter Leguy, Chris Little, Daniel P. Lowry, Mathieu Morlighem, Isabel Nias, Aurelien Quiquet, Martin Rückamp, Nicole-Jeanne Schlegel, Donald Slater, Robin Smith, Fiamma Straneo, Lev Tarasov, Roderik van de Wal, and Michiel van den Broeke: The future sea-level contribution of the Greenland ice sheet: a multi-model ensemble study of ISMIP6 , The Cryosphere, 2020. doi:10.5194/tc-2019-319 Sophie Nowicki, Antony Payne, Heiko Goelzer, Helene Seroussi, William Lipscomb, Ayako Abe-Ouchi, Cecile Agosta, Patrick Alexander, Xylar Asay-Davis, Alice Barthel, Thomas Bracegirdle, Richard Cullather, Denis Felikson, Xavier Fettweis, Jonathan Gregory, Tore Hatterman, Nicolas Jourdain, Peter Kuipers Munneke, Eric Larour, Christopher Little, Mathieu Morlinghem, Isabel Nias, Andrew Shepherd, Erika Simon, Donald Slater, Robin Smith, Fiammetta Straneo, Luke Trusel, Michiel van den Broeke, and Roderik van de Wal: Experimental protocol for sea level projections from ISMIP6 standalone ice sheet models, The Cryosphere, doi:10.5194/tc-2019-322, 2020.

本数据集提供经处理的第六次冰盖模型比对项目（ISMIP6，Ice Sheet Model Intercomparison Project Phase 6）格陵兰冰盖投影模型输出，相关研究已在以下文献中完成记录与分析：Heiko Goelzer、Sophie Nowicki、Anthony Payne等，《格陵兰冰盖对未来海平面的贡献：基于ISMIP6的多模式集合研究》，《冰冻圈》，2020，DOI:10.5194/tc-2019-319。

### 数据说明
1. 除非原始网格已为该规格，所有结果均经过保守重采样，统一至5×5 km的标准ISMIP6网格。
2. 计算范围覆盖格陵兰全域冰覆盖区域，已校正地图投影误差，并纳入了各冰盖模型专属的密度参数。
3. 通过计算每个网格单元内的面积占比，已移除外围冰川与冰帽的贡献。
4. 以`exp*`命名的投影结果，均以对照试验`ctrl_proj`为基准计算差值（文件名中后缀`cr`代表已移除对照基准）。
5. `ctrl_proj`与`historical`的结果未进行对照基准校正（文件名无`cr`后缀）。

### 目录结构

versionid
groupname1
modelname1
expid
scalars_mm_cr_GIS_groupname1_modelname1_expid.nc
scalars_rm_cr_GIS_groupname1_modelname1_expid.nc
scalars_zm_cr_GIS_groupname1_modelname1_expid.nc
...

### 单文件变量说明
#### scalars_mm_cr_GIS（格陵兰全域尺度变量）
- `oarea`：假设海洋面积，单位[m²]
- `rhof`：模型专属淡水密度，单位[kg·m⁻³]
- `rhoi`：模型专属冰密度，单位[kg·m⁻³]
- `rhow`：模型专属海水密度，单位[kg·m⁻³]
- `time`：时间，通常为距起始时刻X的天数
- `iarea`：网格单元内陆地冰覆盖占比（无量纲，取值范围0~1）
- `iareagr`：网格单元内接地冰盖覆盖占比
- `iareafl`：网格单元内冰盖入海流动区域覆盖占比
- `ivol`：冰体总体积，单位[m³]
- `ivolgr`：接地冰体体积，单位[m³]
- `ivolfl`：浮动冰体体积，单位[m³]
- `ivaf`：漂浮线以上冰体体积，单位[m³]
- `lim`：冰体总质量，单位[kg]
- `limgr`：接地冰体质量，单位[kg]
- `limfl`：浮动冰体质量，单位[kg]
- `limaf`：漂浮线以上冰体质量，单位[kg]
- `sle`：海平面等效质量，单位[m]，**注：随冰体质量损失而减小**
- `smb`：空间积分的地表质量平衡异常，单位[kg·s⁻¹]

#### scalars_rm_cr_GIS（对应冰盖质量平衡比对试验第2阶段（IMBIE2）-Rignot流域，xx=[no,ne,se,sw,cw,nw]）
变量与`scalars_mm_cr_GIS`一致，仅变量名附加`_xx`后缀，包括`ivaf_xx`、`smb_xx`、`limaf_xx`、`sle_xx`，注释与上述一致。

#### scalars_zm_cr_GIS（对应冰盖质量平衡比对试验第2阶段（IMBIE2）-Zwally流域，xx=[z11,z12,z13,z14,z21,z22,z31,z32,z33,z41,z42,z43,z50,z61,z62,z71,z72,z81,z82]）
变量与`scalars_mm_cr_GIS`一致，仅变量名附加`_xx`后缀，注释与上述一致。

### 数据使用声明
若使用本数据集的结果，请致谢相关研发人员，致谢措辞可参考如下：
"我们感谢气候与冰冻圈（CliC）计划，其通过赞助研讨会、托管ISMIP6官网与维基百科、推广ISMIP6项目，为该工作提供了支持。我们感谢世界气候研究计划（WCRP），其通过耦合模式工作组协调并推动了CMIP5与CMIP6计划。我们感谢各气候模式组生成并公开其模型输出，感谢地球系统网格联盟（ESGF）对CMIP数据的归档与提供访问渠道，感谢布法罗大学开展ISMIP6数据分发与上传工作，以及所有支持CMIP5、CMIP6与ESGF的多方资助机构。我们感谢ISMIP6指导委员会、ISMIP6模式遴选组与ISMIP6数据集制备组的持续参与，为ISMIP6项目的定义与推进提供支持。"

同时还需引用以下两篇文献：
1. Heiko Goelzer、Sophie Nowicki、Anthony Payne等：《格陵兰冰盖对未来海平面的贡献：基于ISMIP6的多模式集合研究》，《冰冻圈》，2020，DOI:10.5194/tc-2019-319。
2. Sophie Nowicki、Antony Payne、Heiko Goelzer等：《基于ISMIP6独立冰盖模型的海平面预测实验规程》，《冰冻圈》，2020，DOI:10.5194/tc-2019-322。