GBR - Lagoon water quality data (Chlorophyll, Suspended Solids, Nutrients) - Spatial interpolation - 1988 - 2006 (MTSRF 1.1.5, AIMS)

The purpose of this study is to quantify spatial and temporal patterns in water quality of the GBR.

Surface water quality data collected by Miles Furnas and colleagues (AIMS) between 1988 and 2006. Niskin or bucket surface water samples and laboratory analyses of a suite of physical and chemical water quality data, including chlorophyll, suspended solids (SS), and the following nutrients: particulate phosphorus (PP), particulate nitrogen (PN), total dissolved phosphorus (TDP), total dissolved nitrogen (TDN), total phosphorus (TP = PP + TDP), total nitrogen (TN = PN + TDN).

The water column chlorophyll data represent long-term averages of surface water column chlorophyll concentration. They are derived from the data from the GBRMPA and AIMS Long-term chlorophyll monitoring program, and the AIMS Lagoon water quality chlorophyll data, collected since 1992.

As part of the Reef Atlas project (now the eAtlas) the water quality data was interpolated over the whole GBR by Glenn De'ath using Generalized Additive Models with a Quasipoisson fit. This produced the gridded version of the dataset that is available as KMZs and ASCII grid raster files. For access to the original data please contact AIMS.

The spatial coordinate system for the ASCII Grid data files is WGS84 (EPSG:4326), in which the grid cells are equally spaced in latitude and longitude.

Data Units:

* Chlorophyll: micrograms / liter;
* Suspended solids (SS): mg / liter;
* All nutrients: micromol / liter.

References:

- Furnas MJ, Mitchell AW, Skuza MS and Brodie JE (2005) The other 90 percent: phytoplankton responses to enhanced nutrient availability in the Great Barrier Reef lagoon. Marine Pollution Bulletin 51: 253-265

- Furnas MJ (2003) Catchments and Corals: Terrestrial Runoff to the Great Barrier Reef. Australian Institute of Marine Science, CRC Reef. Townsville, Australia.

- De'ath G (2007) The Spatial, Temporal and Structural Composition of Water Quality of the Great Barrier Reef, and Indicators of Water Quality and Mapping Risk. Report to the Australian Government's Marine and Tropical Sciences Research Facility. 59 pp.

- De'ath G, Fabricius KE (2008) Water quality of the Great Barrier Reef: distributions, effects on reef biota and trigger values for the protection of ecosystem health. Final Report to the Great Barrier Reef Marine Park Authority. Australian Institute of Marine Science, Townsville: 104 pp

- Brodie, J, De'ath, G., Devlin, M., Furnas, M, and Wright M. (2007) Spatial and temporal patterns of near-surface chlorophyll a in the Great Barrier Reef lagoon. Marine and Freshwater Research 58:342-353

本研究旨在量化大堡礁（Great Barrier Reef, GBR）水质的时空分布格局。

1988年至2006年间，由迈尔斯·弗纳斯（Miles Furnas）及其团队（澳大利亚海洋科学研究所，Australian Institute of Marine Science, AIMS）采集地表水质数据。研究采用尼斯金采水器（Niskin sampler）或采水桶采集地表水样本，并通过实验室分析得到一系列物理、化学水质指标，涵盖叶绿素、悬浮颗粒物（Suspended Solids, SS），以及如下营养盐：颗粒磷（Particulate Phosphorus, PP）、颗粒氮（Particulate Nitrogen, PN）、总溶解磷（Total Dissolved Phosphorus, TDP）、总溶解氮（Total Dissolved Nitrogen, TDN）、总磷（Total Phosphorus, TP = PP + TDP）、总氮（Total Nitrogen, TN = PN + TDN）。

地表水柱叶绿素数据代表表层水柱叶绿素浓度的长期平均值，其数据来源于大堡礁海洋公园管理局（Great Barrier Reef Marine Park Authority, GBRMPA）与AIMS的长期叶绿素监测项目，以及自1992年起采集的AIMS潟湖水质叶绿素数据。

作为珊瑚礁图集项目（现为电子图集eAtlas）的组成部分，格伦·迪思（Glenn De'ath）使用拟泊松拟合的广义可加模型（Generalized Additive Models, GAM）对整个大堡礁海域的水质数据进行空间插值，生成了可通过KMZ文件与ASCII网格栅格文件获取的网格化数据集。如需获取原始数据，请联系AIMS。

ASCII网格数据文件的空间坐标系为WGS84（EPSG:4326），该坐标系下网格单元的纬度与经度间距均等。

### 数据单位：
* 叶绿素：微克/升；
* 悬浮颗粒物（SS）：毫克/升；
* 所有营养盐：微摩尔/升。

### 参考文献：
1. Furnas MJ, Mitchell AW, Skuza MS 及 Brodie JE (2005) 其余90%：大堡礁潟湖浮游植物对营养盐补给增加的响应。《海洋污染公报》51: 253-265
2. Furnas MJ (2003) 流域与珊瑚：大堡礁的陆地径流。澳大利亚海洋科学研究所、珊瑚礁合作研究中心，澳大利亚汤斯维尔。
3. De'ath G (2007) 大堡礁水质的时空结构组成，以及水质指标与风险制图。提交给澳大利亚政府海洋与热带科学研究设施的报告，共59页。
4. De'ath G, Fabricius KE (2008) 大堡礁水质：分布特征、对珊瑚礁生物群的影响及生态系统健康保护阈值。提交给大堡礁海洋公园管理局的最终报告，澳大利亚海洋科学研究所，汤斯维尔：共104页。
5. Brodie J, De'ath G, Devlin M, Furnas M 及 Wright M (2007) 大堡礁潟湖表层叶绿素a的时空分布格局。《海洋与淡水研究》58: 342-353