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[ferret_users] Plotting with a paleo time scale

To: ferret <ferret_users@xxxxxxxx>
Subject: [ferret_users] Plotting with a paleo time scale
From: Olivier Marti <olivier.marti@xxxxxxxxxxxx>
Date: Wed, 10 Oct 2018 11:35:28 +0200
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Hello,

I want to plot data using a paleo time scale : time is decreasing from a positive value to zero (present day).

The following script gives more details :

USE "https://vesg.ipsl.upmc.fr/thredds/dodsC/store/p86mart/IPSLCM5A2/PROD/Holocene/TR5AS-Vlr01/ATM/Analyse/TS_YE/TR5AS-Vlr01_20000101_79991231_1Y_t2m.nc"

! Model Years are from 2000 to 7999, which correspond to nothing :-(

! I can define a time axis starting at 1, which it's less confusing

LET nt = `t2m_yearmean,RETURN=lsize`

DEFINE AXIS/T=1:`nt`:1/UNITS="Years" YearFromStart

! But the labelling I want is Year before present (present being 1850)

LET/TITLE="Years BP" YearBP=6000-T[GT=YearFromStart]+1

! I can not define the following axis because it's reversed

!DEFINE AXIS/T/UNITS="Years"/NAME="YearBP" YearBP

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