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IB Student Picnic. Wednesday, tomorrow!, 5-8 pm Illini Grove Pavilion (corner of Lincoln and Pennsylvania Ave.) Meet Faculty Free Food Free T-shirt Find out what SIB is all about and meet other IB majors!! Email [email protected] or 333-3044 **Rain Location: 3 rd floor Levis**

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IB Student Picnic

Wednesday, tomorrow!, 5-8 pm

Illini Grove Pavilion

(corner of Lincoln and Pennsylvania Ave.)

Meet Faculty Free Food Free T-shirt

Find out what SIB is all about and meet other IB majors!!

Email [email protected] or 333-3044

**Rain Location: 3rd floor Levis**

(912 W Illinois)


Next lecture humans climate change and ecological responses
Next lecture: Humans, Climate Change, and Ecological Responses


Assignment

Assignment

Responses to Climate Change:

Lecture Outline: print, read, bring…

Learn…

1) 5 major concepts

2) 6 levels of ecological organization

(see 1.1 also)

3) contrast acclimation vs adaptation

Pg. 146-7 in text

Midwest Climate



OBJECTIVES: What creates variation in climate and how does it explain the diversity and distribution of biomes?

  • Build a model for proximal causes of global variation in climate and biomes

  • How do features of the earth contribute to climatic variation?

  • What are causes of temporal changes in climate and biomes?

  • What are local effects on climate?


What are 5 features of earth that affect climate
***What are 5 features of earth that affect climate?


Pre test what feature of the earth causes
***PRE-TEST: What feature of the earth causes:

1) Daily rhythm of dark and light?

2) Temperature warmer at 0º than 90 º?

3) Seasonal change in climate?

4) Less variation in temperature in

N than S?

5) Winds to be diverted from N-S direction?

Rotates on axis

B) Round

C) Tilt of 23º on axis

D) Rotates around sun

E) More land mass in N than S


Answers
Answers:

1) Daily rhythm of dark and light? = A

2) Temperature warmer at 0º than 90 º? = B

3) Seasonal change in climate? = C + D

4) Less variation in temperature in

N than S? = E

5) Winds to be diverted from N-S direction?

= A + B

  • Rotates on axis

    B) Round

    C) Tilt of 23º on axis

    D) Rotates around sun

    E) More land mass in N than S


Overall conceptual model

Overall conceptual model:

Solar radiation 

temperature 

wind and ocean currents 

precipitation


Why does temperature decline at higher latitudes
***Why does temperature decline at higher latitudes?


What accounts for differences in range of temperatures in n vs s hemisphere
***What accounts for differences in range of temperatures in N vs S hemisphere?

N.B. Specific heat is higher for water than land.


What causes seasons and temporal variation in temperature
***What causes seasons and temporal variation in temperature?


Variation in temperature generates winds n b mirrror of s and n hemispheres

Variation in temperature generates winds.(N.B. Mirrror of S and N hemispheres)

Winds drive ocean currents and redistribute heat and moisture.


What are latitudes of tropical rainforests and deserts why
***What are latitudes of tropical rainforests and deserts? Why?


Why is it wet at 0 and dry at 30 hadley cells and itcz inter tropical convergence zone
Why is it wet at 0° and dry at 30°?Hadley cells and ITCZ (inter-tropical convergence zone):


Solar equator itcz moves seasonally

Solar equator (ITCZ) moves seasonally.

(so do belts of temp., wind, and rain)--->

causes seasonal variation in climate.


What causes deflections in air flow from n s coreolis effect affects oceans too
What causes deflections in air flow from N-S? Coreolis effect ; affects oceans too!


Ocean currents 1 differ in n and s 2 redistribute heat and moisture and 3 affect

Ocean currents 1) differ in N and S, 2) redistribute heat and moisture and 3) affect

marine environment on global scale

climates on land.

clockwise

counter-

clockwise

upwelling


Upwelling currents bring cold nutrient rich water to the surface support high productivity
Upwelling currents bring cold, nutrient-rich water to the surface --->support high productivity.


***Why are (most) deserts on W side of continents? What causes the Gobi desert in central Asia?Why does England have temperature deciduous forest rather than boreal forest?


Overall conceptual model1

Overall conceptual model:

Solar radiation 

temperature 

wind and ocean currents 

precipitation


What factors have changed existence and location of biomes through time
***What factors have changed existence and location of biomes through time?

  • Continental drift

  • Mountain building and rain shadows

  • Changes in orbit, tilt, wobble of earth

  • Climate variation

  • past climate change

  • present climate change

  • Human alteration in land cover


Changes in biomes

through geological

time…


El Nino vs. El Nina: note recent increase

in stength + frequency of El Nino





Negative impact of

El Nino on crops

In far-flung places


What determines local climate
***What determines local climate?

  • 1) Proximity to bodies of water

  • Continentalclimates in interiors

    More arid

    More variable

  • Maritime climates on coasts

    Less arid

    Less variable


2 topography gradients in mountains
2) Topography: gradients in mountains

  • Air cools as rises---> temp. decrease-->vegetation changes

  • (6-10°C drop for every 1000 m in elevation)


Why do mountains cause a rainshadow on their leeward side how do they affect biomes
Why do mountains cause a rainshadow on their leeward side? How do they affect biomes?

How do mountain and wind directions affect this?


***Topographysuperimposes local variation on general climatic patterns. What causes these vegetation patterns?



OBJECTIVE evaporation + < soil moisture: What creates variation in climate and how does it explain the diversity and distribution of biomes?

  • Build a model for proximal causes of global variation in climate and biomes

  • What features of the earth contribute to climatic variation?

  • What are causes of temporal changes in climate and biomes?

  • What are local effects on climate?


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