Lab3- Climate change and...

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Lab3- Climate change and BC

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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, 112-114, 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.1273-1277.

"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

Baljit · Accepted Answer

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 corresponding 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 current 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 Temprature
4.26	4.66	5.0599999999999996	5.45	5.85	6.27	6.7	7.14	7.57	8.01	8.44	8.8699999999999992	9.31	9.76	10.24	10.74	11.24	11.74	12.32	12.94	13.55	14.17	14.78	15.39	16.010000000000002	16.690000000000001	17.48	18.260000000000002	19.05	19.829999999999998	20.63	21.45	22.28	23.11	23.93	24.76	25.6	26.43	27.27	28.1	28.93	29.74	30.56	31.38	32.19	33	33.79	34.590000000000003	35.369999999999997	36.159999999999997	36.94	37.71	38.479999999999997	39.24	40.01	40.770000000000003	41.53	42.3	43.06	43.82	44.58	45.34	46.1	46.85	47.61	48.36	49.1	49.85	50.6	51.34	52.09	52.84	53.58	54.35	55.12	55.9	56.69	57.49	58.3	59.11	59.94	60.78	61.63	62.5	63.38	64.260000000000005	65.13	66.010000000000005	66.88	67.739999999999995	68.59	69.430000000000007	70.27	71.099999999999994	71.930000000000007	72.75	73.569999999999993	74.39	75.19	75.989999999999995	76.790000000000006	77.58	78.37	79.150000000000006	79.930000000000007	80.7	81.47	82.24	83.01	83.78	84.55	85.33	86.1	86.88	87.65	88.43	89.21	89.99	90.78	91.56	92.35	93.15	93.94	94.73	95.53	96.33	97.13	97.93	98.74	99.55	100.38	101.23	102.08	102.97	103.87	104.78	105.71	106.65	107.64	108.62	109.6	110.57	111.53	112.45	113.37	114.27	115.15	116.02	116.85	117.68	118.5	119.29	120.09	120.85	121.61	122.36	123.1	123.83	124.54	125.25	125.95	126.65	127.34	128.04	128.74	129.44	130.15	130.86000000000001	131.57	132.29	133.01	133.74	134.47	135.24	136	136.80000000000001	137.63999999999999	138.49	139.43	140.4	141.38999999999999	142.49	143.61000000000001	144.88999999999999	146.18	147.58000000000001	149.11000000000001	150.66999999999999	152.35	154.02000000000001	155.69999999999999	157.38	159.05000000000001	160.72999999999999	0.17096774193548422	0.65483870967741975	4.5161290322576243E-2	-0.30322580645161218	0.84354838709677715	-5.806451612903446E-2	-0.20322580645161142	2.6048387096774155	0.19516129032257734	0.17096774193548422	0.69354838709677602	0.91612903225806563	0.10000000000000073	0.70322580645161503	-0.52419354838709675	-2.2758064516129055	-3.2709677419354795	-2.9935483870967743	-1.811290322580648	-3.5387096774193543	-4.9806451612903215	-5.9387096774193537	-7.095161290322582	-7.9951612903225797	-8.8612903225806452	-7.8967741935483833	-9.1274193548387057	-8.

Lab3- Climate change and BCWatchthis VIDEOIF YOU MISSED THE ONLINE CLASS.Lab 3: Climate Change and BCIce cores provide continuous...

Lab3- Climate change and BC

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