File:Temp-sunspot-co2.svg

# -*- coding: utf-8 -*-
import numpy as np
import matplotlib.pylab as plt
import urllib
 
def smooth(signal, window_size):
    extended_signal = signal[window_size:0:-1] + signal + signal[-1:-window_size:-1]
    s = np.array(extended_signal)
    w = np.hamming(window_size)
    y = np.convolve(w/w.sum(), s, mode="same")
    return y[window_size:-window_size+1]
 
temp_file = urllib.urlopen("http://www.cru.uea.ac.uk/cru/data/temperature/hadcrut3gl.txt")
data_rows = [x.split() for x in temp_file][0:-1:2]
temp_years = [int(x[0]) for x in data_rows]
temps = [float(x[-1]) for x in data_rows]
 
#co2_file = urllib.urlopen("http://web.archive.org/web/20070829134646/http://www.esrl.noaa.gov/gmd/ccgg/trends/co2_mm_mlo.dat")
co2_file = urllib.urlopen("ftp://ftp.cmdl.noaa.gov/ccg/co2/trends/co2_mm_mlo.txt")
data_rows = [x.split() for x in co2_file if not x.startswith("#") and x.find("-99.99") == -1]
co2_years = [(float(x[0]) + (float(x[1])-0.5)/12.) for x in data_rows]
co2concs = [float(x[3]) for x in data_rows]
 
lawco2_file = urllib.urlopen("ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/law/law_co2.txt")
data_rows = [x.split() for x in lawco2_file if x.startswith("     1")]
del data_rows[[float(x[0]) for x in data_rows].index(1010.):]
lawco2_years = [float(x[0]) for x in data_rows]
lawco2concs = [float(x[-1]) for x in data_rows]
 
sunspot_file = urllib.urlopen("http://sidc.oma.be/DATA/yearssn.dat")
data_rows = [x.split() for x in sunspot_file if "*" not in x]
sun_years = [float(x[0]) for x in data_rows]
sunspots = [float(x[-1]) for x in data_rows]
 
smoothed_temps = smooth(temps, 25)
smoothed_sunspots = smooth(sunspots, 25)
 
base_ax = plt.axes()
base_ax.yaxis.tick_left()
plt.yticks([])
plt.xlim(1850,2012)
plt.xlabel("Year", size=16)
plt.title("Temperature, CO$_2$, and Sunspots", size=22)
 
temp_ax = plt.axes([0.125,0.5,0.775,0.4], frameon=False)
temp_ax.yaxis.tick_left()
plt.plot(temp_years, temps, '#FF2200')
tline  = plt.plot(temp_years, smoothed_temps, '#AA0000', lw=3)
plt.xlim(1850,2012)
plt.yticks(np.arange(-0.6,0.6,0.2))
plt.ylabel(u'Temperature anomaly (C)', size=14)
plt.xticks([])
 
co2_ax = plt.axes([0.125,0.3,0.775,0.4], frameon=False)
co2_ax.yaxis.tick_right()
co2_ax.yaxis.set_label_position("right")
co2_ax.xaxis.tick_bottom()
plt.plot(co2_years, co2concs, '#44AAFF')
cline = plt.plot(lawco2_years, lawco2concs, '#2288EE', lw=2)
plt.xlim(1850,2012)
plt.ylabel(r'CO$_2$ (ppm)', size=14)
plt.xticks([])
 
sun_ax = plt.axes([0.125,0.1,0.775,0.4], frameon=False)
sun_ax.yaxis.tick_left()
plt.plot(sun_years, sunspots, "#FFDD00")
sline = plt.plot(sun_years, smoothed_sunspots, "#FF9900", lw=3)
plt.xlim(1850,2012)
plt.yticks(np.arange(0,200,50))
plt.ylabel("Sunspot number", size=14)
plt.xticks([])
 
plt.axes(base_ax)
plt.legend((tline, cline, sline), ("Temperature", "CO$_2$", "Sunspots"), "upper left")
plt.savefig("temp-co2-sunspot.svg")
plt.show()