File:NASA-GISTEMP-Hemispheres.svg

Uploaded by Geek3
Upload date 2024-08-24T10:31:23Z
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File size 86.2 KB

Summary

Description
English: Graph showing the development of average temperatures from 1880 till 2023 for each hemisphere separately. Data from https://data.giss.nasa.gov/gistemp/graphs/. This plot may and should be updated using the code below, whenever new data points become available.
Date
Source Own work
Author Geek3
SVG development
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 The SVG code is valid.
 This plot was created with Matplotlib.
Source code
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Python code

#! /usr/bin/env python3
# -*- coding:utf8 -*-

import matplotlib.pyplot as plt
import numpy as np
from math import *

plt.style.use('classic')

years = range(1880, 2023+1)
northern = [
-.28, -.17, -.20, -.27, -.42, -.43, -.43, -.43, -.23, -.17, # 188x
-.38, -.26, -.39, -.47, -.38, -.30, -.19, -.16, -.28, -.21, # 189x
-.09, -.13, -.33, -.38, -.48, -.29, -.24, -.48, -.46, -.49, # 190x
-.44, -.42, -.46, -.42, -.19, -.14, -.42, -.58, -.40, -.35, # 191x
-.31, -.12, -.28, -.22, -.19, -.14,  .01, -.14, -.10, -.34, # 192x
-.02,  .04, -.06, -.26,  .00, -.09, -.03,  .12,  .16,  .09, # 193x
 .18,  .23,  .13,  .18,  .27,  .10,  .03,  .08, -.02, -.03, # 194x
-.15,  .05,  .06,  .24, -.02, -.09, -.23,  .04,  .15,  .12, # 195x
 .08,  .08,  .13,  .14, -.19, -.14, -.02,  .03, -.07, -.03, # 196x
-.04, -.15, -.17,  .10, -.18, -.05, -.21,  .12,  .02,  .08, # 197x
 .17,  .37,  .05,  .25,  .04, -.00,  .13,  .25,  .37,  .27, # 198x
 .53,  .41,  .14,  .19,  .37,  .58,  .27,  .52,  .71,  .48, # 199x
 .50,  .64,  .71,  .75,  .66,  .86,  .82,  .85,  .68,  .73, # 200x
 .90,  .74,  .81,  .80,  .92, 1.18, 1.31, 1.18, 1.03, 1.21, # 201x
1.35, 1.14, 1.16, 1.50] # 202x
southern = [
-.04,  .01,  .00, -.06, -.14, -.24, -.20, -.28, -.12, -.03, # 188x
-.32, -.19, -.15, -.15, -.21, -.14, -.02, -.04, -.25, -.13, # 189x
-.06, -.17, -.21, -.36, -.45, -.22, -.20, -.29, -.40, -.47, # 190x
-.42, -.45, -.24, -.26, -.10, -.13, -.30, -.35, -.20, -.19, # 191x
-.23, -.25, -.29, -.31, -.35, -.30, -.22, -.29, -.29, -.38, # 192x
-.29, -.22, -.26, -.32, -.25, -.30, -.26, -.18, -.19, -.13, # 193x
 .09,  .16,  .00, -.02,  .14,  .09, -.17, -.14, -.20, -.20, # 194x
-.21, -.18, -.03, -.07, -.25, -.20, -.16,  .05, -.03, -.06, # 195x
-.13,  .03, -.06, -.03, -.20, -.07, -.09, -.08, -.09,  .15, # 196x
 .09, -.02,  .20,  .23,  .03,  .02,  .01,  .24,  .11,  .25, # 197x
 .35,  .27,  .23,  .38,  .28,  .24,  .23,  .41,  .40,  .27, # 198x
 .37,  .40,  .31,  .28,  .26,  .32,  .39,  .42,  .52,  .28, # 199x
 .29,  .44,  .54,  .50,  .42,  .50,  .46,  .47,  .41,  .59, # 200x
 .55,  .47,  .48,  .55,  .57,  .62,  .72,  .66,  .66,  .74, # 201x
 .68,  .55,  .62,  .85] # 202x

n_avg = 5
northern_avg = np.convolve(northern, np.ones((n_avg,))/n_avg, mode='valid')
southern_avg = np.convolve(southern, np.ones((n_avg,))/n_avg, mode='valid')

plt.rc('font', size=15)
fig = plt.figure(figsize=(680 / 90.0, 450 / 90.0), dpi=72)
plt.plot(years, northern, 'ro-', linewidth=0.7, markersize=4, label='Northern Hemisphere')
plt.plot(years[n_avg//2:-(n_avg//2)], northern_avg, 'r-', lw=2.5, zorder=-1, label='5 Year Mean')
plt.plot(years, southern, 'bo-', linewidth=0.7, markersize=4, label='Southern Hemisphere')
plt.plot(years[n_avg//2:-(n_avg//2)], southern_avg, 'b-', lw=2.5, zorder=-1, label='5 Year Mean')
plt.grid(True)
plt.xlim(floor(min(years)/5.)*5., ceil(max(years)/5.)*5.)
plt.ylim(-0.6, 1.52)
plt.ylabel(u'Temperature Anomaly (\u00B0C)')
plt.title('Hemispheric Temperature Change')
plt.legend(loc='upper left', prop={'size':13})
plt.tight_layout()
plt.savefig('NASA-GISTEMP-Hemispheres.svg')

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28 March 2018

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