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Lab3- Climate change and BC Watchthis VIDEOIF YOU MISSED THE ONLINE CLASS. Lab 3: Climate Change and BC Ice cores provide continuous...

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Lab3- Climate change and BC


















Watchthis VIDEOIF YOU MISSED THE ONLINE CLASS.


Lab 3: Climate Change and BC



Ice cores provide continuous data that is crucial for reconstructing past climate conditions, including local temperature, precipitation rate, humidity, wind speed, and changes in atmospheric composition. In this assignment, we will analyze the original data from the renowned Vostok Ice Cores, which were obtained from one of the thickest sections (>4km) of the East Antarctic Ice Sheet.






Part 1: Ice and Gas Ages and Temperature in the Vostok Core







Open the attached Excel fileand navigate to the "Vostok" tab. The dataset includes columns indicating the depth of the ice core in meters, the ages of the ice and gas layers in thousands of years ago, concentrations of carbon dioxide and methane trapped in ice bubbles, and delta temperatures that represent variations in the temperature of the ocean from which the ice originally formed. The delta temperature values are relative to the current temperature in degrees Celsius.






Question 1:



Create a scatter plot with straight lines representing the delta temperature curve against the ice age (X-axis) and include it in your report. Based on the data, determine the range of temperature variation in the past. Additionally, identify the timescale over which a shift from minimum to maximum temperature can occur.






Question 2:



Based on your graph, estimate the start and end periods of the last complete glacial conditions (without any transition zones). Also, identify the start and end periods of the current interglacial conditions. Include the graph in your report.






Part 3: Atmospheric Composition and Temperature






Ice cores also provide information about the atmospheric composition, particularly the levels of CO2 and CH4 gases. In this section, we will combine the different data pieces from the ice core. Refer to the provided graphs showing the concentration of CO2 and CH4, as well as the delta temperature as a function of age, to answer the following questions.






Question 3:



Observe the major warming events on the delta temperature graph, and then analyze the corresponding changes in CO2 and CH4 concentrations during the same periods. Explain the observed pattern in the graph and discuss the factors or mechanisms responsible for this pattern.


References:


Analysis of Vostok Ice Core Data,



https://globalchange.umich.edu/globalchange1/current/labs/Lab10_Vostok/Vostok.htm


Monnin et al. "Atmospheric CO2 concentrations over
the last glacial termination" Science v.291, XXXXXXXXXX, 5 January 2001.


Dansgaard, W., H.B. Clausen, N. Gundestrup, C. U. Hammer, S. J. Johnsen, P. M. Kristinsdottir, and N. Reeh, A New Greenland Deep Ice Core, Science, Vol. 218, 1992, p XXXXXXXXXX.


"Deciphering Mysteries of Past Climate From Antarctic Ice Cores" Earth in Space (American GeophysicalUnion), Vol. 8, No. 3, November 1995, p. 9.


Crane, Robert G., James F. Kasting, and Lee R. Kump. The Earth System.New Jersey: Prentice Hall, 1999.



http://www.aad.gov.au/asset/images/525_ul-core.jpg







Answered 3 days After May 17, 2023

Solution

Baljit answered on May 20 2023
23 Votes
Question 1:-
Scatter Plot of Ice Age Vs Delta temperature with Ice Age on X-axis scale and Delta temperature on Y-axis scale.
Now in above graph we can see that Highest point in above plot is 3.1oC and Lowest peak is -9.5oC.So From the Above scatter plot We can see the temperature varied is from -9.5oC to 3.1oC.
Now observe the ice age time co
esponding to Highest and Lowest temperature peak so we can see that Timescale over which a shift from minimum to maximum temperature can occur is 133.01ka to 19.83ka .
Question 2:-
The glacial conditions is time interval in ice age for which temperature marked by colder and interglacial conditions is time period between two glacial period for which temperature is warmer.
To calculate the last glacial period we will check plot from left side , first point will be point for which delta temperature starts decreasing that is below 0o and second point will be point for which temperature increased above 0o.
So The start and end point of last glacial conditions is 123.83ka and 10.74ka
Respectively. Similarly the start and end point of cu
ent interglacial conditions is 9.31ka and 4.26ka Respectively.
Question 3:-
Lest take the example of major warming event starting from 146.18ka to 133.01ka .In the same time period we can observe from the CO2 and CH4 trend that concentration of Co2 and CH4 in environment also increased. So we can say that with the increase in concentration of CO2 and CH4 in environment the temperature of atmosphere is also increases which lead to warming event.

Ice Age Vs Delta...
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