natdin reference list

Question

\documentclass{article}
\bibliographystyle{natdin}
\bibliography

I would like to have the same authors in my reference list in order of the year of the publication:

author a 2003
author b 2005
author b 20010
author c 2004

At the moment the some references in the list looks like this:

author a 2003
author b 2010
author b 2005
author c 2004

How can I solve this problem?

Here are four sample entries:

@InProceedings{Morgenstern2012, 
  Title = {The role of thermal erosion in the degradation of Siberian ice-rich permafrost}, 
  Author = {Morgenstern, A.}, 
  Booktitle = {Thermokarst and thermal erosion: Degradation of Siberian ice-rich permafrost}, 
  Year = {2012}, 
  Editor = {Morgenstern, A.}, 
  Pages = {73--92}, 
  Timestamp = {2014.11.04}
} 
@PhdThesis{Morgenstern2012Dis, 
  Title = {Thermokarst and thermal erosion: Degradation of Siberian ice-rich permafrost}, 
  Author = {Morgenstern, A.}, 
  School = {Alfred-Wegener-Institut für Polar- und Meeresforschung}, 
  Year = {2012}, 
  Timestamp = {2014.11.04}
} 
@Article{Morgenstern2011, 
  Title = {Spatial analyses of thermokarst lakes and basins in Yedoma landscapes of the Lena Delta}, 
  Author = {Morgenstern, A. and Grosse, G. and Günther F. and Fedorova I. and Schirrmeister L.}, 
  Journal = {The Cryosphere}, 
  Year = {2011}, 
  Pages = {849--867}, 
  Volume = {5}, 
  Timestamp = {2014.11.04}
}
@InProceedings{Morgenstern2008, 
  Title = {Genetic, Morphological, and Statistical Characterization of Lakes in the Permafrost-Dominated Lena Delta}, 
  Author = {Morgenstern, A. and Grosse, G. and Schirrmeister L.},
  Booktitle = {Ninth International Conference on Permafrost}, 
  Year = {2008},
  Address = {Fairbanks}, 
  Editor = {Kane, Dougles L. and Hinkel Kenneth M.}, 
  Pages = {1239--1244}, 
  Publisher = {Institute of Northern Engineering University of Alaska}, 
  Volume = {2}, 
  Timestamp = {2014.11.04}
}

Answer 1

I've converted your code snippets into a compilable document (see below). (You were missing a few commas separating surnames from given names, by the way.) The ordering of the four entries performed by the natdin style is entirely standard: The sorting is done first by authors and only then by year. That's why the two solo-authored pieces by Morgenstern, both published in 2012, are listed before the piece by Morgenstern, Grosse, Günther, et al (2011), which, in turn, correctly precedes the piece by Morgenstern, Grosse, and Schirrmeister (2008). If the four pieces are cited with a \citep directive, the same ordering results -- again, correctly so.

Changing the algorithm so that only the very first author matters for sorting purposes is possible, but it would go against just about every known bibliographic convention. In short, I wouldn't do it.

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{filecontents}
\begin{filecontents*}{\jobname.bib}
@InProceedings{Morgenstern2012, 
  Title = {The role of thermal erosion in the degradation of Siberian ice-rich permafrost}, 
  Author = {Morgenstern, A.}, 
  Booktitle = {Thermokarst and thermal erosion: Degradation of Siberian ice-rich permafrost}, 
  Year = {2012}, 
  Editor = {Morgenstern, A.}, 
  Pages = {73--92}, 
  Timestamp = {2014.11.04}
} 
@PhdThesis{Morgenstern2012Dis, 
  Title = {Thermokarst and thermal erosion: Degradation of Siberian ice-rich permafrost}, 
  Author = {Morgenstern, A.}, 
  School = {Alfred-Wegener-Institut für Polar- und Meeresforschung}, 
  Year = {2012}, 
  Timestamp = {2014.11.04}
} 
@Article{Morgenstern2011, 
  Title = {Spatial analyses of thermokarst lakes and basins in Yedoma landscapes of the Lena Delta}, 
  Author = {Morgenstern, A. and Grosse, G. and Günther, F. and Fedorova, I. and Schirrmeister, L.}, 
  Journal = {The Cryosphere}, 
  Year = {2011}, 
  Pages = {849--867}, 
  Volume = {5}, 
  Timestamp = {2014.11.04}
}
@InProceedings{Morgenstern2008, 
  Title = {Genetic, Morphological, and Statistical Characterization of Lakes in the Permafrost-Dominated Lena Delta}, 
  Author = {Morgenstern, A. and Grosse, G. and Schirrmeister, L.},
  Booktitle = {Ninth International Conference on Permafrost}, 
  Year = {2008},
  Address = {Fairbanks}, 
  Editor = {Kane, Dougles L. and Hinkel, Kenneth M.}, 
  Pages = {1239--1244}, 
  Publisher = {Institute of Northern Engineering University of Alaska}, 
  Volume = {2}, 
  Timestamp = {2014.11.04}
}
\end{filecontents*}
\usepackage[round]{natbib}
\bibliographystyle{natdin}
\begin{document}
\citep{Morgenstern2012, Morgenstern2012Dis, Morgenstern2011, Morgenstern2008}
\bibliography{\jobname}
\end{document}