Pearl River Estuary

There are several major cities in the Pearl River Estuary, including Shenzhen, Guangzhou, and Zhuhai, where rapid industrialization and urbanization have adversely impacted water quality in downstream of the Pearl River system [JL89]. Eutrophication has produced serious red tide events or harmful algal blooms in the estuary and its adjacent coastal waters since the 1980s, causing economic losses [CTP+07]

• Imputation with trained STIMP in the Pearl River Estuary
  • Fig 3b: Missing rate is equal to 0.1
  • Fig 3b: Missing rate is equal to 0.3
  • Fig 3b: Missing rate is equal to 0.5
  • Fig 3b: Missing rate is equal to 0.7
  • Fig 3b: Missing rate is equal to 0.9
  • Fig 3c: case study
  • Response Letter DINEOF(t=1) vs DINEOF(t=46)
• Prediction performance of STIMP in Pearl River Estuary
  • Supplementary Fig 4a: imputation reduces the mean square error of prediction
  • Supplementary Fig 2a: overall prediction performance in terms of mean square error
  • Supplementary Fig 4a: imputation reduces the mean absolute error of prediction
  • Fig 2b: overall performance in term of mean absolute error
  • Fig 3d: mean absolute error of PredRNN
  • Fig 3d: mean absolute error of STIMP w/o Imputation
  • Fig 3d: mean absolute error of STIMP
  • Fig 3d: improvement of STIMP’s prediction function compared to PredRNN
  • Fig 3e: improvement of STIMP compared to PredRNN
  • Fig 3f: STIMP achieved higher improvement in locations with higher rates of missing data
  • Fig 3h: Horizontal distribution of observed temporally averaged Chl a
  • Fig 3h: Horizontal distribution of predicted temporally averaged Chl_a
  • Fig 3g: Time series of domain mean Chl a from January 2017 to December 2022
• Case study of prediction performance in Pearl River Estuary
  • Fig 3i: Predicted Chl_a of CMOMS, STIMP and PredRNN at Position 1
  • Fig 3i: Predicted Chl_a of CMOMS, STIMP and PredRNN at Position 2
  • Fig 3i: Predicted Chl_a of CMOMS, STIMP and PredRNN at Position 3
  • Fig 3j: True Chl_a, predicted Chl_a of STIMP and DINEOF on 2 February 2016
  • Fig 3j: Predicted Chl_a of STIMP on 2 February 2016
  • Fig 3j: True Chl_a, predicted Chl_a of STIMP and DINEOF on 16 July 2016
  • Fig 3j: True Chl_a, predicted Chl_a of STIMP and DINEOF on 8 January 2016

References

[CTP+07]

Chuqun Chen, Shiling Tang, Zhilin Pan, Haigang Zhan, Magnus Larson, and Lennart Jönsson. Remotely sensed assessment of water quality levels in the pearl river estuary, china. Marine pollution bulletin, 54(8):1267–1272, 2007.

[JL89]

Amithirlgala W Jayawardena and Feizhou Lai. Time series analysis of water quality data in pearl river, china. Journal of Environmental Engineering, 115(3):590–607, 1989.