File:Milankovic cycles 140-0 ka bp 3.svg
Original file (SVG file, nominally 1,439 × 810 pixels, file size: 73 KB)
Captions
Captions
Summary
[edit]
| Description |
English: Milankovic cycles, last 140 000 years |
| Date | |
| Source | Own work |
| Author | Merikanto |
- Plot ice age orbital parameters
- with Python climlab
- many curves of parameters
- 19.10.2021 0000.0000
import numpy as np
import matplotlib.pyplot as plt
from scipy.interpolate import make_interp_spline, BSpline
from climlab.solar.orbital import OrbitalTable
from climlab.solar.insolation import daily_insolation
from climlab import constants as const
yearsmax1=-140
yearsmax2=(-1*yearsmax1)+1
years = np.linspace(yearsmax1, 0,yearsmax2)
yearlabels=np.linspace(yearsmax1,0)
numxlabels=15
xlabels=np.linspace(yearsmax1,0,numxlabels)
xlabels2=xlabels*-1
xlabels2[numxlabels-1]=0
orb = OrbitalTable.interp(kyear=years)
print(orb)
kyear = orb['kyear']
ecc = orb['ecc']
long_peri = orb['long_peri']%360
obliquity = orb['obliquity']
precession = orb['precession']
insolation_65n=orb['65NJul']
sin_long_peri=np.sin(np.deg2rad(long_peri))
S65_15 = daily_insolation(lat=65, day=15, orb=orb)
S65_90 = daily_insolation(lat=65, day=90, orb=orb)
S65_180 = daily_insolation(lat=65, day=180, orb=orb)
years2 = np.linspace(years.min(), years.max(), 200)
yearlabels2=np.linspace(yearsmax1,0,200)
- define spline
spl = make_interp_spline(years, S65_15, k=3)
S65_15_smoothed = spl(years2)
spl = make_interp_spline(years, S65_90, k=3)
S65_90_smoothed = spl(years2)
spl = make_interp_spline(years, S65_180, k=3)
S65_180_smoothed = spl(years2)
plt.figure(1)
plt.subplot(411)
- plt.xticks(direction='in')
plt.xticks(ticks=xlabels, labels=[])
plt.yticks(fontsize=14)
plt.title("Milanković cycles, last ice age",color="#7f0000", size=18)
plt.ylabel("Eccentricity", fontsize=15)
plt.plot(years,ecc, color="#00007f" )
plt.subplot(412)
- plt.xticks(fontsize=14)
plt.xticks(ticks=xlabels, labels=[])
plt.yticks(fontsize=14)
plt.ylabel("Oliquity", fontsize=15)
plt.plot(years,obliquity, color="#00007f")
plt.subplot(413)
- plt.xticks(fontsize=14)
plt.xticks(ticks=xlabels, labels=[])
plt.yticks(fontsize=14)
plt.ylabel("Precession", fontsize=15)
plt.plot(years,precession, color="#00007f" )
- plt.subplot(514)
- plt.xticks(fontsize=14)
- plt.xticks(ticks=xlabels, labels=[])
- plt.yticks(fontsize=14)
- plt.ylabel("sin (Per.)", fontsize=15)
- plt.plot(years,sin_long_peri, color="#00007f" )
plt.subplot(414)
- plt.xticks(fontsize=14)
plt.xticks(ticks=xlabels,labels=xlabels2, fontsize=14)
plt.yticks(fontsize=14)
plt.ylabel("Insolation", fontsize=15)
plt.plot(years,insolation_65n, color="#ff7f00" )
plt.xlabel("Thousands of years ago ",size=16 )
plt.show()
Licensing
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- 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.
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 10:45, 19 October 2021 | | 1,439 × 810 (73 KB) | Merikanto (talk | contribs) | Uploaded own work with UploadWizard |
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