Bishop 103 Climate Determinants

Discussion on the significance of understanding climate in ecology and ecosystems.
Climate influences abiotic factors, which in turn affect species evolution and ecosystem dynamics.

Definition and location of rain shadow:
- Formed by mountains where coastal/land interactions occur.
- Windward side: receives moisture; leeward side: arid/dry conditions.
Example: Olympic Mountains in Washington State.
Expectation to compare Hadley cells and rain shadow effects on the exam.
- Key concepts to consider: Air behavior influenced by temperature (warm air holds more moisture).

Importance of annual precipitation in determining desert classification:
- Defined as receiving equal to or less than 25 cm yearly. (Subsequently noted as 250 mm annually)
Impact of latitude on desert formation:
- Deserts observed particularly at 30°N and 30°S, e.g., Eurasia and Africa.
Mechanism of desert formation due to sinking cold, dry air masses:
- Differentiation between moisture distribution based on altitude and distance from the ocean.
Continental interiors often exhibit arid conditions when far from moisture sources.

Coastal mountain ranges leading to rain shadow effects.
Continental interiors lacking moisture recharge.
Specific deserts' formations with geographical references:
- Locations like Central China as an example of distance leading to aridity.
Coastal vs. inland climates; moderated by ocean proximity resulting in less extreme climates along coastlines.
Cold ocean currents' impact on aridity:
- Example: Chile, which despite its coastal location, features deserts due to cold ocean currents.

Driest deserts globally referenced:
- Atacama Desert: Receives less than 1 mm of rainfall annually, highlighting extreme aridity.
- Comparison with Gobi Desert, Sahara Desert, and polar deserts like Antarctica.
Annual precipitation statistics remain crucial in understanding desert conditions.

Video on ocean currents demonstrating complexity.
Currents driven by temperature, salinity, and basin configuration.
Coriolis Effect and its implications on atmospheric circulation:
- Different circulation in Northern vs. Southern Hemisphere: Clockwise in the North, counterclockwise in the South.
The relationship between warm water currents and moisture-rich air vs. cold water currents leading to dry air.
- A clear indication that following cold currents leads to very dry air.

Significance of the Peru Current and its role in creating the conditions for the Atacama Desert's aridity due to cold waters raising less moisture.
Influence of Andes Mountain Range creating a rain shadow with prevailing easterly winds, contrasting with western US mountains where precipitation occurs.
Synergistic effect of cold, dry air from the Hadley cells adding to arid conditions in the Atacama Desert.
Brief storm events causing flooding due to extreme dryness and precipitation scarcity.

Introduction of Galapagos finches as crucial subjects of study, emphasizing their evolutionary adaptations to different ecological niches.
Distribution of finches represented visually alongside climate data to showcase precipitation's effect on species distribution.
- Various colors indicating varying precipitation levels across islands, e.g., Santa Cruz and San Cristobal.
- Discussion prompts regarding species distributions in relation to rainfall patterns.

Setting the stage for upcoming discussions on climate change, emphasizing its critical nature and interrelation to the core concepts of climate determinants just discussed.
Expectation of further inquiry into climate's broader impacts and species adaptation.