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	tadd sequential plot of grounding line migration - pism-exp-gsw - ice stream an…
	git clone git://src.adamsgaard.dk/pism-exp-gsw
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	---
	commit 548a0043c892eee76690872d37ae27deaf5dd7e5
	parent e4dac5432aa0219eae7c6a5b35a6751018a6b55f
	Author: Anders Damsgaard <[email protected]>
	Date: Mon, 29 Nov 2021 11:46:44 +0100

	add sequential plot of grounding line migration

	Diffstat:
	M Makefile \| 5 ++++-
	A plot-time-series.py \| 125 +++++++++++++++++++++++++++++…

	2 files changed, 129 insertions(+), 1 deletion(-)
	---
	diff --git a/Makefile b/Makefile
	t@@ -3,7 +3,7 @@ SLSERIES=sealvl.nc

	all: \
	ABC1_1a_M1_A1-flux.pdf\
	- ex_1a_M1_A1_1d.nc\
	+ evol_1a_M1_A1_1d.pdf\
	#ABC1_1a_M3_A1-flux.pdf\
	#ABC1_3a_M1_A1-flux.pdf\
	#ABC1_3a_M3_A1-flux.pdf\
	t@@ -20,6 +20,9 @@ ABC1_3a_M1_A1-flux.pdf: ABC1_3a_M1_A1.nc plot.py
	ABC1_3a_M3_A1-flux.pdf: ABC1_3a_M3_A1.nc plot.py
	./plot.py ABC1_3a_M3_A1.nc

	+evol_1a_M1_A1_1d.pdf: ex_1a_M1_A1_1d.nc
	+ ./plot-time-series.py ex_1a_M1_A1_1d.nc
	+
	ex_1a_M1_A1_1d.nc: ex_ABC1_1a_M1_A1.nc
	flowline.py -o $@ --collapse -d y ex_ABC1_1a_M1_A1.nc

	diff --git a/plot-time-series.py b/plot-time-series.py
	t@@ -0,0 +1,124 @@
	+#!/usr/bin/env python3
	+
	+from pylab import figure, subplot, plot, xlabel, ylabel, title, axis, vlines, …
	+from sys import exit
	+
	+import MISMIP
	+
	+import numpy as np
	+from optparse import OptionParser
	+import os.path
	+
	+try:
	+ from netCDF4 import Dataset as NC
	+except:
	+ print("netCDF4 is not installed!")
	+ sys.exit(1)
	+
	+def process_options():
	+ "Process command-line options and arguments."
	+ parser = OptionParser()
	+ parser.usage = "%prog <input files> [options]"
	+ parser.description = "Plots the ice flux as a function of the distance fro…
	+ parser.add_option("-o", "--output", dest="output", type="string",
	+ help="Output image file name (e.g. -o foo.png)")
	+
	+ opts, args = parser.parse_args()
	+
	+ if len(args) == 0:
	+ print("ERROR: An input file is requied.")
	+ exit(0)
	+
	+ if len(args) > 1 and opts.output:
	+ print("More than one input file given. Ignoring the -o option...\n")
	+ opts.output = None
	+
	+ return args, opts.output, opts
	+
	+
	+def read(filename, name):
	+ "Read a variable and extract the middle row."
	+ nc = NC(filename)
	+
	+ try:
	+ var = nc.variables[name][:]
	+ except:
	+ print("ERROR: Variable '%s' not present in '%s'" % (name, filename))
	+ exit(1)
	+
	+ return var
	+
	+
	+def find_grounding_line(x, topg, thk, mask):
	+ "Find the modeled grounding line position."
	+ # "positive" parts of x, topg, thk, mask
	+ topg = topg[x > 0]
	+ thk = thk[x > 0]
	+ mask = mask[x > 0]
	+ x = x[x > 0] # this should go last
	+
	+ def f(j):
	+ "See equation (7) in Pattyn et al, 'Role of transition zones in marine…
	+ z_sl = 0
	+ return (z_sl - topg[j]) * MISMIP.rho_w() / (MISMIP.rho_i() * thk[j])
	+
	+ for j in range(x.size):
	+ if mask[j] == 2 and mask[j + 1] == 3: # j is grounded, j+1 floating
	+ nabla_f = (f(j + 1) - f(j)) / (x[j + 1] - x[j])
	+
	+ # See equation (8) in Pattyn et al
	+ return (1.0 - f(j) + nabla_f * x[j]) / nabla_f
	+
	+ raise Exception("Can't find the grounding line")
	+
	+
	+def plot_profile(in_file, out_file):
	+
	+ if out_file is None:
	+ out_file = os.path.splitext(in_file)[0] + "-profile.pdf"
	+
	+ mask = read(in_file, 'mask')
	+ usurf = read(in_file, 'usurf')
	+ topg = read(in_file, 'topg')
	+ thk = read(in_file, 'thk')
	+ x = read(in_file, 'x')
	+
	+ # mask out ice-free areas
	+ usurf = np.ma.array(usurf, mask=mask == 4)
	+
	+ # compute the lower surface elevation
	+ lsrf = topg.copy()
	+ lsrf[mask == 3] = -MISMIP.rho_i() / MISMIP.rho_w() * thk[mask == 3]
	+ lsrf = np.ma.array(lsrf, mask=mask == 4)
	+
	+ # convert x to kilometers
	+ x /= 1e3
	+
	+ figure(1)
	+ ax = subplot(111)
	+ for i in range(0, thk.shape[0]):
	+ # modeled grounding line position
	+ #xg_PISM = find_grounding_line(x, topg[i], thk[i], mask[i])
	+ #plot(x, np.zeros_like(x), ls='dotted', color='red')
	+ icecolor = cm.cool(i / thk.shape[0])
	+ plot(x, topg[i], color='black')
	+ plot(x, usurf[i], color=icecolor, label='{}'.format(i))
	+ plot(x, lsrf[i], color=icecolor)
	+ xlabel('distance from the divide, km')
	+ ylabel('elevation, m')
	+
	+ _, _, ymin, ymax = axis(xmin=0, xmax=x.max())
	+ #_, _, ymin, ymax = axis(xmin=x.min(), xmax=x.max())
	+
	+ #vlines(xg / 1e3, ymin, ymax, linestyles='dashed', color='black')
	+ #vlines(xg_PISM / 1e3, ymin, ymax, linestyles='dashed', color='red')
	+
	+ legend()
	+ print("Saving '%s'...\n" % out_file)
	+ savefig(out_file)
	+
	+if __name__ == "__main__":
	+ args, out_file, opts = process_options()
	+
	+ for in_file in args:
	+ plot_profile(in_file, out_file)
	+\ No newline at end of file