@@ -5,6 +5,7 @@ Added
 * The yaxis_inverted and xaxis_inverted is now considered when loading and
   saving a matplotlib axes
 * Added the `seaborn-style` command line argument
+* Added the `concat_dim` command line argument
 
 
 v1.0.0
 
@@ -5,9 +5,11 @@
 from itertools import chain
 from collections import defaultdict
 import yaml
+import xarray as xr
 import psyplot
 from psyplot.docstring import docstrings
 from psyplot.warning import warn
+from psyplot.compat.pycompat import get_default_value
 from funcargparse import FuncArgParser
 import logging
 
@@ -47,7 +49,8 @@ def main(args=None):
 def make_plot(fnames=[], name=[], dims=None, plot_method=None,
               output=None, project=None, engine=None, formatoptions=None,
               tight=False, rc_file=None, encoding=None, enable_post=False,
-              seaborn_style=None):
+              seaborn_style=None,
+              concat_dim=get_default_value(xr.open_mfdataset, 'concat_dim')):
     """
     Eventually start the QApplication or only make a plot
 
@@ -93,6 +96,9 @@ def make_plot(fnames=[], name=[], dims=None, plot_method=None,
     seaborn_style: str
         The name of the style of the seaborn package that can be used for
         the :func:`seaborn.set_style` function
+    concat_dim: str
+        The concatenation dimension if multiple files in `fnames` are
+        provided
     """
     if project is not None and (name != [] or dims is not None):
         warn('The `name` and `dims` parameter are ignored if the `project`'
@@ -134,7 +140,7 @@ def make_plot(fnames=[], name=[], dims=None, plot_method=None,
             raise ValueError("Unknown plot method %s!" % plot_method)
         p = pm(
             fnames, name=name, dims=dims or {}, engine=engine,
-            fmt=formatoptions or {}, mf_mode=True)
+            fmt=formatoptions or {}, mf_mode=True, concat_dim=concat_dim)
         p.export(output, tight=tight)
     return
 
@@ -244,6 +250,8 @@ def get_parser(create=True):
 
     parser.update_arg('seaborn_style', short='sns')
 
+    parser.update_arg('concat_dim', short='cd')
+
     if create:
         parser.create_arguments()
 
 
@@ -3,6 +3,7 @@
 That's a test"""
 import os
 import six
+import inspect
 
 if six.PY3:
 
@@ -23,6 +24,12 @@ def iterkeys(d):
     def getcwd(*args, **kwargs):
         return os.getcwd(*args, **kwargs)
 
+    def get_default_value(func, arg):
+        argspec = inspect.getfullargspec(func)
+        return next(default for a, default in zip(reversed(argspec[0]),
+                                                  reversed(argspec.defaults))
+                    if a == arg)
+
     basestring = str
     unicode_type = str
     bytes_type = bytes
@@ -56,6 +63,12 @@ def iterkeys(d):
     def getcwd(*args, **kwargs):
         return os.getcwdu(*args, **kwargs)
 
+    def get_default_value(func, arg):
+        argspec = inspect.getargspec(func)
+        return next(default for a, default in zip(reversed(argspec[0]),
+                                                  reversed(argspec.defaults))
+                    if a == arg)
+
     basestring = basestring
     unicode_type = unicode
     bytes_type = str
 
@@ -12,6 +12,7 @@
 import six
 from copy import deepcopy as _deepcopy
 import logging
+import inspect
 import pickle
 from importlib import import_module
 from itertools import chain, repeat, cycle, count
@@ -33,7 +34,8 @@
     ArrayList, open_dataset, open_mfdataset, _MissingModule,
     to_netcdf, Signal, CFDecoder, safe_list, InteractiveList)
 from psyplot.plotter import unique_everseen, Plotter
-from psyplot.compat.pycompat import OrderedDict, range, getcwd
+from psyplot.compat.pycompat import (OrderedDict, range, getcwd,
+                                     get_default_value as _get_default_value)
 try:
     from cdo import Cdo as _CdoBase
     with_cdo = True
@@ -62,6 +64,9 @@
 _versions = get_versions(requirements=False)
 
 
+_concat_dim_default = _get_default_value(xarray.open_mfdataset, 'concat_dim')
+
+
 def _update_versions():
     """Update :attr:`_versions` with the registered plotter methods"""
     for pm_name in plot._plot_methods:
@@ -410,13 +415,16 @@ def close(self, figs=True, data=False, ds=False):
     docstrings.delete_params('ArrayList.from_dataset.parameters', 'base')
     docstrings.delete_kwargs('ArrayList.from_dataset.other_parameters',
                              kwargs='kwargs')
+    docstrings.keep_params('xarray.open_mfdataset.parameters', 'concat_dim')
 
     @_only_main
     @docstrings.get_sectionsf('Project._add_data')
     @docstrings.dedent
     def _add_data(self, plotter_cls, filename_or_obj, fmt={}, make_plot=True,
                   draw=None, mf_mode=False, ax=None, engine=None, delete=True,
-                  share=False, clear=False, enable_post=None, *args, **kwargs):
+                  share=False, clear=False, enable_post=None,
+                  concat_dim=_concat_dim_default,
+                  *args, **kwargs):
         """
         Extract data from a dataset and visualize it with the given plotter
 
@@ -465,6 +473,8 @@ def _add_data(self, plotter_cls, filename_or_obj, fmt={}, make_plot=True,
             enabled and post processing scripts are allowed. If ``None``, this
             parameter is set to True if there is a value given for the `post`
             formatoption in `fmt` or `kwargs`
+        %(xarray.open_mfdataset.parameters.concat_dim)s
+            This parameter only does have an effect if `mf_mode` is True.
         %(ArrayList.from_dataset.parameters.no_base)s
 
         Other Parameters
@@ -476,7 +486,8 @@ def _add_data(self, plotter_cls, filename_or_obj, fmt={}, make_plot=True,
         if not isinstance(filename_or_obj, xarray.Dataset):
             if mf_mode:
                 filename_or_obj = open_mfdataset(filename_or_obj,
-                                                 engine=engine)
+                                                 engine=engine,
+                                                 concat_dim=concat_dim)
             else:
                 filename_or_obj = open_dataset(filename_or_obj,
                                                engine=engine)