The APEX Large CO Heterodyne Orion Legacy Survey (ALCOHOLS). I. Survey
  overview
  The Orion molecular cloud complex harbours the nearest GMCs and site of
high-mass star formation. Its YSO populations are thoroughly characterized. The
region is therefore a prime target for the study of star formation.
  Here, we verify the performance of the SuperCAM 64 pixel heterodyne array on
APEX. We give a descriptive overview of a set of wide-field CO(3-2) spectral
cubes obtained towards the Orion GMC complex, aimed at characterizing the
dynamics and structure of the extended molecular gas in diverse regions of the
clouds, ranging from very active sites of clustered star formation in Orion B
to comparatively quiet regions in southern Orion A.
  We present a 2.7 square degree (130pc$^2$) mapping survey in the CO(3-2)
transition, obtained using SuperCAM on APEX at an angular resolution of 19''
(7600AU or 0.037pc at a distance of 400pc), covering L1622, NGC2071, NGC2068,
OriB9, NGC2024, and NGC2023 in Orion B, and the southern part of the L1641
cloud in Orion A.
  We describe CO integrated emission and line moment maps and position-velocity
diagrams and discuss a few sub-regions in some detail. Evidence for expanding
bubbles is seen with lines splitting into double components, most prominently
in NGC2024, where we argue that the bulk of the molecular gas is in the
foreground of the HII region. High CO(3-2)/CO(1-0) line ratios reveal warm CO
along the western edge of Orion B in the NGC2023/NGC2024 region facing the
IC434 HII region. Multiple, well separated radial velocity components seen in
L1641-S suggest that it consists of a sequence of clouds at increasingly larger
distances. We find a small, spherical cloud - the 'Cow Nebula' globule - north
of NGC2071. We trace high velocity line wings for the NGC2071-IR outflow and
the NGC2024 CO jet. The protostellar dust core FIR4 (rather than FIR5) is the
true driving source of the NGC2024 monopolar outflow.
