Exercise 3 0 -4036 -49 -45 Paleoclimate (1) The following three plots show clima

Question

Exercise 3 0 -4036 -49 -45 Paleoclimate (1) The following three plots show climate histories, with A an Atlantic Ocean floor bed drilling, B an ice core from Greenland, and C an ice core from Antarctica. 20 40 Answer concisely the following questions: a) measurements? Which materials have been used for the What do the scales on top mean? How can the variations in time be interpreted? c) If we compare plot B to C, we see that they are very similar in shape, but the values in plot C are systematically lower than those in B. 100 120 140 Explain both the similarity and the difference Plot A is also similar to plots B and CB en C, but has a very different scaling: the scale is in opposite direction, Time (10 years BP) and the variations are smaller. e) Explain these two phenomena (opposite scale and smaller variations)

Explanation / Answer

QUESTION a)

O18 ISOTOPE IS THE MATERIAL USED FOR THE MEASUREMENT. because here the all three samples are related to water either they are ocean water or ice does not matter . O18 value changes as the transgression or regression takes place inside the ocean.

question b)

the scale on the top shows the value of O18 in parts per thousand. the negative and possitive value indicate the value with respect to standerd o18 value.

question c)

the variation in time can be interpreted on the basis of given time interval in the graph.

question d)

o18 value inside the ocean is varialble as the transgression or regrassion take place inside the ocean. we have fixed a standerd value of the o18. we the regression takes place means the maximum water is evaporatin from the ocean to the atmosphere. as we know the o18 isotope is heavier than o16 so o18 remain inside the ocean and it increases the value inside the ocean but the vapor get precipitated on the ice sheets and it decreases the o18 value over there .

and if transgression takes place inside the ocean, the glaciers start melting and the huge lighter water with negative o18 value mixed with the water and it decreases the o18 value of ocean.

now come to the graphs here we are seeing on A at present it is near to the zero and the B and C has less negative o18 value it indecate the transgressive phase is going on. as we go to the past with time we see at 20thousand year back we have a more positive value on A but more negative value on B and C which indecate a regressive phase.

after 20thousand years we have a huge time period of trasgressive phase with little regression.

B and C both are the sample from the ice sheet but B is from greenland while C is from Antarctica. here we see the variation on o18 value much variable in B as compared to C . since B sample is near to pole but not from the pole so they melt or crystallise more glacier as compared to pole thats why we are getting the more variation in the o18 value of B sample.

question E

opposite scale - opposite scale in the sense that as the sea water decreases it increases the o18 value inside it while it decreases the o18 value on the ice sheets this indicate the opposite scale . and in the graph we are seeing sample A varies 0 to positive while other more negative to less negative.

smaller variation- we can see the smaller variation in the greenland sample. it take place when the antarctice sample graph is linear while it varies with time up and down.

Related Questions

Navigate

• Browse (All)
• Browse E
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.