HadISDH.blend: gridded global monthly land and ocean surface humidity data version 1.5.0.2023f

This is the HadISDH.blend 1.5.0.2023f version of the Met Office Hadley Centre Integrated Surface Dataset of Humidity (HadISDH). HadISDH.blend is a near-global gridded monthly mean surface humidity climate monitoring product. It is created from in situ observations of air temperature and dew point temperature from ships and weather stations. The observations have been quality controlled and homogenised / bias adjusted. Uncertainty estimates for observation issues and gridbox sampling are provided (see data quality statement section below). These data are provided by the Met Office Hadley Centre. This version spans 1/1/1973 to 31/12/2023.

The data are monthly gridded (5 degree by 5 degree) fields. Products are available for temperature and six humidity variables: specific humidity (q), relative humidity (RH), dew point temperature (Td), wet bulb temperature (Tw), vapour pressure (e), dew point depression (DPD).

This version extends the previous version to the end of 2023. It combines the latest version of HadISDH.land and HadISDH.marine and therefore their respective update notes. Users are advised to read the update documents in the Docs section for full details.

To keep informed about updates, news and announcements follow the HadOBS team on twitter @metofficeHadOBS.

For more detailed information e.g bug fixes, routine updates and other exploratory analysis, see the HadISDH blog: http://hadisdh.blogspot.co.uk/

References:

When using the dataset in a paper please cite the following papers (see Docs for link
to the publications) and this dataset (using the "citable as" reference):

Willett, K. M., Dunn, R. J. H., Kennedy, J. J. and Berry, D. I., 2020: Development of
the HadISDH marine humidity climate monitoring dataset. Earth System Sciences Data,
12, 2853-2880, https://doi.org/10.5194/essd-12-2853-2020

Freeman, E., Woodruff, S. D., Worley, S. J., Lubker, S. J., Kent, E. C., Angel, W. E.,
Berry, D. I., Brohan, P., Eastman, R., Gates, L., Gloeden, W., Ji, Z., Lawrimore, J.,
Rayner, N. A., Rosenhagen, G. and Smith, S. R., ICOADS Release 3.0: A major update to
the historical marine climate record. International Journal of Climatology.
doi:10.1002/joc.4775.

Willett, K. M., Dunn, R. J. H., Thorne, P. W., Bell, S., de Podesta, M., Parker, D. E.,
Jones, P. D., and Williams Jr., C. N.: HadISDH land surface multi-variable humidity and
temperature record for climate monitoring, Clim. Past, 10, 1983-2006,
doi:10.5194/cp-10-1983-2014, 2014.

Dunn, R. J. H., et al. 2016: Expanding HadISD: quality-controlled, sub-daily station
data from 1931, Geoscientific Instrumentation, Methods and Data Systems, 5, 473-491.

Smith, A., N. Lott, and R. Vose, 2011: The Integrated Surface Database: Recent
Developments and Partnerships. Bulletin of the American Meteorological Society, 92,
704-708, doi:10.1175/2011BAMS3015.1

We strongly recommend that you read these papers before making use of the data, more
detail on the dataset can be found in an earlier publication:

Willett, K. M., Williams Jr., C. N., Dunn, R. J. H., Thorne, P. W., Bell, S., de
Podesta, M., Jones, P. D., and Parker D. E., 2013: HadISDH: An updated land surface
specific humidity product for climate monitoring. Climate of the Past, 9, 657-677,
doi:10.5194/cp-9-657-2013.

本数据集为英国气象局哈德利中心（Met Office Hadley Centre）集成地表湿度数据集（HadISDH）的HadISDH.blend 1.5.0.2023f版本。HadISDH.blend是一款准全球网格化逐月平均地表湿度气候监测产品，基于船舶与气象站获取的气温、露点温度原位（in situ）观测数据构建。所有观测数据均经过质量控制、均一化处理与偏差校正，已提供观测误差与格点采样的不确定性估算方法（详见下文的数据质量说明章节）。本数据集由英国气象局哈德利中心发布，本次版本的时间跨度为1973年1月1日至2023年12月31日。

本数据集为5°×5°分辨率的网格化逐月场，包含气温与六类湿度变量产品：比湿（specific humidity，q）、相对湿度（relative humidity，RH）、露点温度（Td）、湿球温度（Tw）、水汽压（vapour pressure，e）及露点差（DPD）。

本次版本将前序版本的时间范围延伸至2023年末，整合了最新版的陆地地表湿度数据集（HadISDH.land）与海洋地表湿度数据集（HadISDH.marine），并同步包含两者各自的更新说明。建议用户查阅文档章节中的更新文档以获取完整细节。

如需获取更新、新闻与公告，请关注Twitter上的HadOBS团队账号@metofficeHadOBS。

如需了解更多细节（如程序漏洞修复、常规更新及其他探索性分析内容），请访问HadISDH官方博客：http://hadisdh.blogspot.co.uk/

### 参考文献
若在学术论文中使用本数据集，请引用如下文献（文献链接详见文档章节），并按标注为“可引用（citable as）”的格式引用本数据集：
1. Willett, K. M., Dunn, R. J. H., Kennedy, J. J. 与 Berry, D. I., 2020：《HadISDH海洋湿度气候监测数据集的构建》，《地球系统科学数据》，12卷，2853-2880页，https://doi.org/10.5194/essd-12-2853-2020
2. Freeman, E., Woodruff, S. D., Worley, S. J. 等：《ICOADS Release 3.0：历史海洋气候记录的重大更新》，《国际气候学期刊》，doi:10.1002/joc.4775
3. Willett, K. M., Dunn, R. J. H., Thorne, P. W., Bell, S., de Podesta, M., Parker, D. E., Jones, P. D. 与 Williams Jr., C. N.：《用于气候监测的HadISDH陆地地表多变量湿度与气温记录》，《过去的气候》，10卷，1983-2006页，doi:10.5194/cp-10-1983-2014, 2014
4. Dunn, R. J. H. 等, 2016：《扩展HadISD：1931年起的质量控制亚日尺度台站数据》，《地球科学仪器、方法与数据系统》，5卷，473-491页
5. Smith, A., N. Lott 与 R. Vose, 2011：《集成地表数据集：最新进展与合作项目》，《美国气象学会公报》，92卷，704-708页，doi:10.1175/2011BAMS3015.1

我们强烈建议在使用本数据集前阅读上述文献，关于本数据集的更多细节可参阅早期发表的研究：
Willett, K. M., Williams Jr., C. N., Dunn, R. J. H., Thorne, P. W., Bell, S., de Podesta, M., Jones, P. D. 与 Parker D. E., 2013：《HadISDH：一款用于气候监测的更新版陆地表比湿数据集》，《过去的气候》，9卷，657-677页，doi:10.5194/cp-9-657-2013.