厦门大学：《海洋环境化学》课程教学资源（PPT课件讲稿）Chap.4 Marine eutrophication and Red tide（part 2）

Contents Introduction a Part One Mechanisms in marine pollution Part two Topics in marine pollution Part three Measurement of biological response toxicity and water quality assessments

Contents ◼ Introduction ◼ Part One Mechanisms in marine pollution ◼ Part two Topics in marine pollution ◼ Part three Measurement of biological response toxicity and water quality assessments ◼ ……

Part two Topics in marine pollution Chap 2 Marine oxygen-demanded organic pollution Chap 3 Eutrophication and Red tide Chap 4 Oil pollution of the sea Chap 5 Marine synthetic organic pollution Chap 6 Heavy metal contamination in the sea Chap. 7 Marine radioactivity pollution Chap. 8 Marine heat pollution Chap 9 Other topics of marine polltion

Part two Topics in marine pollution ◼ Chap.2 Marine oxygen-demanded organic pollution ◼ Chap.3 Eutrophication and Red tide ◼ Chap.4 Oil pollution of the sea ◼ Chap.5 Marine synthetic organic pollution ◼ Chap.6 Heavy metal contamination in the sea ◼ Chap.7 Marine radioactivity pollution ◼ Chap.8 Marine heat pollution ◼ Chap.9 Other topics of marine polltion

Chap 3 Eutrophication and Red tide 3.1 What is Eutrophication?(definition) 3.2 Why should we be concerned? (harmful effect 3. 3 The nutrient in the coastal seawater 3.4 Eutrophication in the coastal seawater 3.5 HABs and red tide

Chap.3 Eutrophication and Red tide 3.1 What is Eutrophication? (definition) 3.2 Why Should We Be Concerned? (harmful effect) 3.3 The nutrient in the coastal seawater 3.4 Eutrophication in the coastal seawater 3.5 HABs and Red tide

Eutrophication Eutrophication is the natural process by which waters (lakes, rivers etc)become excessively enriched with nutrients, typically nitrogen and phosphorus. It is one of the ways in which a water body(lake, rivers, and seas) transforms from a state where nutrients are scarce (oligotrophic), through a slightly richer phase (mesotrophic) to an enriched state(eutrophic Human activities often enhance the rate of change due to activities such as farming, forestry road-building, industry and waste treatment that cause nutrients to enter watercourses. This nutrient enrichment often results in a population explosion of algae and other aquatic plants

Eutrophication Eutrophication is the natural process by which waters (lakes, rivers etc) become excessively enriched with nutrients, typically nitrogen and phosphorus. It is one of the ways in which a water body (lake, rivers, and seas) transforms from a state where nutrients are scarce (oligotrophic), through a slightly richer phase (mesotrophic) to an enriched state (eutrophic). Human activities often enhance the rate of change due to activities such as farming, forestry, road-building, industry and waste treatment that cause nutrients to enter watercourses. This nutrient enrichment often results in a population explosion of algae and other aquatic plants

Eutrophication BOD and Eutrophication -rapid succession in a body of water because of an increase in biological productivity (Oligotrophic lakes and rivers have clear water and low biological productivity) -low nutrient levels high nutrient levels good light penetratio poor light penetration -high dissolved oxygen low dissolved oxygen deep waters shallow waters -low algal growth -high algal growth small mouth bass, lake trout carp bullhead, catfish pike, sturgeon, whitefish (a)Oligotrophic lake (b)Eutrophic lake

Eutrophication BOD and Eutrophication - rapid succession in a body of water because of an increase in biological productivity. (Oligotrophic lakes and rivers have clear water and low biological productivity)

lower nutient input high nutient input l事1 oguchi epilimnion、加 gh production …∴…/ thermocline… hypolimnion Chigh orgen weand permit olume OL/GOTROPHIC E

Chap 3 Eutrophication and Red tide 3.1 What is Eutrophication?(definition) 3.2 Why should we be concerned? (harmful effect 3. 3 The nutrient in the coastal seawater 3.4 Eutrophication in the coastal seawater 3.5 HABs and red tide

Chap.3 Eutrophication and Red tide 3.1 What is Eutrophication? (definition) 3.2 Why Should We Be Concerned? (harmful effect) 3.3 The nutrient in the coastal seawater 3.4 Eutrophication in the coastal seawater 3.5 HABs and Red tide

3. 3 The nutrient in the coastal seawater A. Sources B. nitrogen in the seawater C. phosphate in the seawater

3.3 The nutrient in the coastal seawater A. Sources B. nitrogen in the seawater C. phosphate in the seawater

3. 3 The nutrient in the coastal seawater The main addition of Nand p compounds to the marine environment are considered to be sewage wastes, either directly discharged to the sea or via rivers into which treated waste are discharged Other sources are agricultural runoff and wastes from food processing industries but these are normally considered to be small compared to the input of sewage

◼ The main addition of N and P compounds to the marine environment are considered to be sewage wastes, either directly discharged to the sea or via rivers into which treated waste are discharged. ◼ Other sources are agricultural runoff and wastes from food processing industries,but these are normally considered to be small compared to the input of sewage. 3.3 The nutrient in the coastal seawater