File:Middle weichselian oxygen isotope curve 1.gif
Original file (1,600 × 766 pixels, file size: 196 KB, MIME type: image/gif)
Captions
Captions
Summary[edit]
| Description |
Part of middle Weichselian/Devensian/Würm/Wisconsin ice age NGRIP oxygen isotope curve. Colder is up, warmer is down. Numbers are thousands of years ago. |
| Date | 1 April 2006 (original upload date) |
| Source | No machine-readable source provided. Own work assumed (based on copyright claims). |
| Author | No machine-readable author provided. Merikanto~commonswiki assumed (based on copyright claims). |
Licensing[edit]
|
I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. |
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="Middle Weichselian 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)
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(25000,60000)
ax1.set_ylim(-33.0, -48.0)
- 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="#b0b0ff", 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="#0000FF", linewidth=4, 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(1000))
ax1.xaxis.set_minor_locator(MultipleLocator(200))
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
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 17:58, 12 September 2020 | | 1,600 × 766 (196 KB) | Merikanto (talk | contribs) | New layout |
| 11:37, 1 April 2006 |  | 630 × 324 (10 KB) | Merikanto~commonswiki (talk | contribs) | Part of middle Weichselian/Devensian/Würm/Wisconsin ice age NGRIP oxygen isotope curve. Colder is up, warmer is down. Numbers are thousands of years ago. |
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