Identify two times when summertime insolation at was especially high. Round
your answer to the nearest 10 kyr (.e.g. for 27 kyr you would enter 30 , while for 23
kyr you would enter 20).
[Blank-1] kyr
[Blank-2] kyr
Blank # 1 Alank # 2 25d
Question 15 (4 points)
Would you expect the Earth’s obliquity to be large or small during these times?
Large
Small

Question

Identify two times when summertime insolation at

was especially high. Round
your answer to the nearest 10 kyr (.e.g. for 27 kyr you would enter 30 , while for 23
kyr you would enter 20).
[Blank-1] kyr
[Blank-2] kyr
Blank # 1 Alank # 2 25d
Question 15 (4 points)
Would you expect the Earth’s obliquity to be large or small during these times?
Large
Small

UpStudy AI · Accepted Answer

1. The amount of summer insolation at $$65^{\circ}\mathrm{N}$$ is strongly influenced by both the precession (with a period of roughly 20 kyr) and the obliquity (with a period of about 41 kyr) of the Earth’s orbit.
2. Periods when these factors constructively interfere—i.e. when the Northern Hemisphere summer occurs at perihelion and the obliquity is high—will produce especially high summer insolation.
3. When the timing of these orbital changes is expressed in thousands of years (kyr), the high‐insolation phases are often seen to occur roughly at $$\sim 10$$ kyr and $$\sim 30$$ kyr (after rounding to the nearest 10 kyr as specified).
4. Because a large obliquity increases the contrast between summer and winter insolation, we would indeed expect the Earth’s obliquity to be large during these times.

$$
\textbf{Blank-1: }10\,\text{kyr} \quad \textbf{Blank-2: }30\,\text{kyr}\quad \text{and obliquity is large.}
$$
[Blank-1] 10 kyr [Blank-2] 30 kyr Obliquity is large during these times.

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