Initial MST radar observations of upper tropospheric-lower stratospheric duct-like structures over Jicamarca, Peru 1Center for Solar-Terrestrial Research, New Jersey Institute of Technology, 323 Martin Luther King Jr. Boulevard, 101 Tiernan Hall, Newark, NJ 07102-1982, USA
22 Nov 2012
2Radio Observatorio de Jicamarca, Instituto Geofisico del Peru, Lima, Peru
Received: 11 March 2011 – Published in Atmos. Chem. Phys. Discuss.: 04 July 2011 Abstract. Persistent wind jet structures along zonal and meridional fields, believed to
be caused by stationary gravity waves, were detected in February 1999 in
mesosphere-stratosphere-troposphere (MST) radar wind measurements of the
troposphere and lower stratosphere over Jicamarca, Peru. Over a continuous
seven day span of MST-data analyzed in this study, two days of observations
showed signatures of wave-like structures in the upper troposphere/lower
stratosphere wind jets associated with the phases of the stationary gravity
waves. We believe these wave-like structures are ducted gravity waves. We
present these initial observations, their characteristics, and the results of
simple numerical simulations used in an attempt to mimic these observed
features. Although a fair replication of the observed ducted structure in the
numerical model is found, the observed period of ~90 min is nonetheless
much longer than what is traditionally observed. As a result, the specific
physical nature of the observed structures is not fully established.
Nevertheless, given the high quality of the observations, we demonstrate here
that continued analysis of this data set and concurrent modeling efforts will
allow for a better understanding of Doppler ducts at high spatial and
temporal resolution, and the results presented here can ultimately be applied
to studies of middle atmospheric fronts, ducts, and bores.
Revised: 14 October 2012 – Accepted: 17 October 2012 – Published: 22 November 2012
Citation: Li, Z., Naqvi, S., Gerrard, A. J., Chau, J. L., and Bhattacharya, Y.: Initial MST radar observations of upper tropospheric-lower stratospheric duct-like structures over Jicamarca, Peru, Atmos. Chem. Phys., 12, 11085-11093, doi:10.5194/acp-12-11085-2012, 2012.