File:Insolation of day 180 at 15 45 65n in earth 140000 0 bp 1.svg
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Summary
[edit]DescriptionInsolation of day 180 at 15 45 65n in earth 140000 0 bp 1.svg |
English: Summer insolation in Northern Hemisphere.
Insolation of day 180 at 15,45 and 65N, last 140 000 years. |
Date | |
Source | Own work |
Author | Merikanto |
- Plot ice age orbital parameters
- with Python climlab
- 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
numxlabels=8
smoothsteps=200
yearsmax2=(-1*yearsmax1)+1
years = np.linspace(yearsmax1, 0,yearsmax2)
yearlabels=np.linspace(yearsmax1,0)
years2 = np.linspace(years.min(), years.max(), smoothsteps)
yearlabels2=np.linspace(yearsmax1,0,smoothsteps)
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']
- print (obliquity)
S15_180 = daily_insolation(lat=15, day=180, orb=orb)
S25_180 = daily_insolation(lat=25, day=180, orb=orb)
S35_180 = daily_insolation(lat=35, day=180, orb=orb)
S45_180 = daily_insolation(lat=45, day=180, orb=orb)
S55_180 = daily_insolation(lat=55, day=180, orb=orb)
S65_180 = daily_insolation(lat=65, day=180, orb=orb)
S75_180 = daily_insolation(lat=75, day=180, orb=orb)
- define spline
spl = make_interp_spline(years, S15_180, k=3)
S15_180_smoothed = spl(years2)
spl = make_interp_spline(years, S25_180, k=3)
S25_180_smoothed = spl(years2)
spl = make_interp_spline(years, S35_180, k=3)
S35_180_smoothed = spl(years2)
spl = make_interp_spline(years, S45_180, k=3)
S45_180_smoothed = spl(years2)
spl = make_interp_spline(years, S55_180, k=3)
S55_180_smoothed = spl(years2)
spl = make_interp_spline(years, S65_180, k=3)
S65_180_smoothed = spl(years2)
spl = make_interp_spline(years, S75_180, k=3)
S75_180_smoothed = spl(years2)
- now plotting ...
fig, ax1 = plt.subplots()
- ax2 = ax1.twinx()
plt.suptitle("Insolation of day 180, W/m²",size=18 )
ax1.set_xlabel("Thousands of years ago ",size=20 )
ax1.set_ylabel("Insolation of day 180, W/m²",color="#7f0000", size=20)
ax1.plot(years2, S15_180_smoothed, color="#ff0000", linestyle=":",label="15° N")
ax1.plot(years2, S45_180_smoothed, color="#ff0000", linestyle="-.",label="45° N")
ax1.plot(years2, S65_180_smoothed, color="#ffaf00", linewidth=6,label="65° N")
ax1.xaxis.set_tick_params(labelsize=16)
ax1.yaxis.set_tick_params(labelsize=16)
ax1.set_xticks(xlabels)
ax1.set_xticklabels(xlabels2)
ax1.legend(fontsize=16, loc=2)
plt.show()
Licensing
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- Under the following conditions:
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 09:48, 19 October 2021 | 1,206 × 549 (49 KB) | Merikanto (talk | contribs) | Uploaded own work with UploadWizard |
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