Types of Dead Zones:
Some dead zones last longer than others, some only exist for a short period of time before disappearing.
Scientists have categorised Dead Zones into 4 broad types:
-Permanent
-Temporary
-Seasonal
-Diel Cycling
The figures below are all obtained from:
Teacher Ocean Science. (2011). Learn About.
http://www.teachoceanscience.net/teaching_resources/education_modules/dead_zones/learn_about/. Last accessed 10th Mar 2014.
Some dead zones last longer than others, some only exist for a short period of time before disappearing.
Scientists have categorised Dead Zones into 4 broad types:
-Permanent
-Temporary
-Seasonal
-Diel Cycling
The figures below are all obtained from:
Teacher Ocean Science. (2011). Learn About.
http://www.teachoceanscience.net/teaching_resources/education_modules/dead_zones/learn_about/. Last accessed 10th Mar 2014.
Figure 1:Permanent Hypoxia:
Permanent Hypoxia occurs in the benthic zone where the oxygen level is usually below 2mg/L.
Permanent Hypoxia occurs in the benthic zone where the oxygen level is usually below 2mg/L.
Figure 2:Temporary Hypoxia:
Temporary hypoxia only exists for days/hours.
Temporary hypoxia only exists for days/hours.
Figure 3:Seasonal Hypoxia:
Seasonal hypoxia occurs every year but only during the warm months. (May-August)
Seasonal hypoxia occurs every year but only during the warm months. (May-August)
Figure 4:Diel Cycling Hypoxia:
Diel cycling hypoxia occurs in warm months(May-September) as well, but it only during the night.
Diel cycling hypoxia occurs in warm months(May-September) as well, but it only during the night.