File:Late glacial temperature curve bolling2.png
Original file (1,600 × 766 pixels, file size: 329 KB, MIME type: image/png)
Captions
Summary[edit]
DescriptionLate glacial temperature curve bolling2.png |
Suomi: Late glacial temperature curve. This is based on NGRIP
Greenland Ice core oxygen isotope ratio data. The "ka" means 1000 year calendar years ago. So 14 ka means 14 000 calenrad years ago ("cal BP"). Major warmings in curve are beginning of the Bölling initial warming ca 14.5 ka cal BP and beginning of the Holocene ca 11,6 Ka BP. |
Date | |
Source | Own work |
Author | Merikanto |
Licensing[edit]
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
Additional information[edit]
Data for this file is from http://www.iceandclimate.nbi.ku.dk/data/NGRIP_d18O_and_dust_5cm.xls http://www.iceandclimate.nbi.ku.dk/data/ processed to csv
δ18O values and dust concentrations
The dataset provides NGRIP δ18O
values, dust concentrations, and GICC05 ages in 5cm depth resolution for the
period 0-60 ka (δ18O) and 10-60 ka (dust).
The dataset accompany the following papers:
NGRIP members, Nature, 431, 147-151, 2004. DOI: 10.1038/nature02805
Gkinis et al., Earth Planet. Sci. Lett., 405, 132-141, 2014. DOI:
10.1016/j.epsl.2014.08.022
Ruth et al., J. Geophys. Res., 108, 4098, 2003. DOI: 4010.1029/2002JD002376
- drawing climate diagram in python 3
- version 2.11
- 11.9.2020
-
import matplotlib.pyplot as plt
import numpy as np
import pandas as pd
from scipy import interpolate
from matplotlib.ticker import (MultipleLocator, AutoMinorLocator)
import scipy.signal
def running_mean(x, N):
cumsum = np.cumsum(np.insert(x, 0, 0))
return (cumsum[N:] - cumsum[:-N]) / float(N)
datafilename="ngrip1.csv"
captioni="Late Glacial period in NGRIP ice core"
savename="ngrip_dryas.svg"
figsizex=16
figsizey=8
- x = []
- y = []
- y2= []
dfin0=pd.read_csv(datafilename, sep=";")
lst1=['gicc05_age','delta_O18']
dfin1 = dfin0[dfin0.columns.intersection(lst1)]
x0=dfin1['gicc05_age']
y0=dfin1['delta_O18']
- y20=dfin1['GISP_dO18']
- y30=dfin1['GISP2_dO18']
x=np.array(x0)
y=np.array(y0)
- y2=np.array(y20)
- y3=np.array(y30)
- list1=[]
- list1.append(y)
- list1.append(y2)
- list1.append(y3)
- data1=np.array(list1)
- print (np.shape(data1))
- data_avg1=np.average(data1, axis=0)
- print(x)
- print(y)
- quit(0)
size0=14
size1=16
size2=18
size3=24
- y_savgol = scipy.signal.savgol_filter(y,31, 3)
y_savgol = scipy.signal.savgol_filter(y,71, 3)
- y_running = running_mean(y, 31)
x_sm = np.array(x)
y_sm = np.array(y)
x_smooth = np.linspace(x_sm.min(), x_sm.max(), 20000)
funk1 = interpolate.interp1d(x_sm, y_sm, kind="cubic")
y_smooth = funk1(x_smooth)
fig, ax1 = plt.subplots()
- ax1.axis((11600,14000,0,ymax1))
ax1.set_xlim(10000,20000)
ax1.set_ylim(-32.0, -45.0)
- ax1.set_ylim(-35.0, -42.0)
plt.gca().invert_xaxis()
plt.gca().invert_yaxis()
ax1.set_ylabel('delta-O18', color='#0000ff', fontsize=size2+2)
ax1.plot(x,y, color="#a0a0ff", linewidth=1,label="NGRIP delta-O18")
- ax1.plot(x_smooth,y_smooth, color="#0000ff", linewidth=3,label="NGRIP delta-O18")
ax1.plot(x,y_savgol, color="#FF0000", linewidth=3, label="SavGol filter, 71 and 3")
- ax1.plot(x,y_running, color="#FF0000", linewidth=3)
- ax1.plot(x,data_avg1, color="#ff0000", linewidth=2, linestyle=":", label="Average of NGRIP, GISP, GISP2 delta-O18")
ax1.tick_params(axis='both', which='major', labelsize=size2)
ax1.xaxis.set_minor_locator(MultipleLocator(500))
ax1.xaxis.set_minor_locator(MultipleLocator(50))
ax1.yaxis.set_minor_locator(MultipleLocator(1.0))
ax1.yaxis.set_minor_locator(MultipleLocator(0.1))
ax1.grid(which='major', linestyle='-', linewidth='0.1', color='black')
ax1.grid(which='minor', linestyle=':', linewidth='0.1', color='black')
ax1.set_xlabel('Age BP', color="darkgreen", fontsize=size2)
ax1.set_title(captioni, fontsize=size3, color="#0000af")
plt.legend(fontsize=size0)
fig = plt.gcf()
fig.set_size_inches(figsizex, figsizey, forward=True)
plt.savefig(savename, format="svg", dpi = 100)
plt.show()
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 17:13, 12 September 2020 | 1,600 × 766 (329 KB) | Merikanto (talk | contribs) | New time span, data and layout | |
12:48, 30 November 2015 | 910 × 579 (53 KB) | Merikanto (talk | contribs) | User created page with UploadWizard |
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Horizontal resolution | 39.37 dpc |
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Vertical resolution | 39.37 dpc |
Software used |