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Sebastian A. Krogh
and
John W. Pomeroy

1. Introduction Recent changes in the Arctic region climate ( Wanishsakpong et al. 2016 ; Whitfield et al. 2004 ), vegetation ( Xu et al. 2013 ), and other environmental functions ( Hinzman et al. 2005 ) motivate investigation of the future hydrology of the Arctic. Changes in streamflow discharge ( Mendoza et al. 2015 ; Arheimer and Lindström 2015 ; Gelfan et al. 2017 ), permafrost thaw ( Woo et al. 2007 ), subsurface water storage and flow ( Walvoord et al. 2012 ), and snow accumulation and

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Bappaditya Nag
,
V. Misra
, and
S. Bastola

; Wagener et al. 2001 ; Boyle et al. 2001 ), the Nedbør-Afstrømnings model (NAM; Madsen 2000 ), and the Tank model ( Sugawara 1995 ). The HyMOD accounts for two different components in the hydrology of the watersheds. The fast component comprises surface processes like runoff while the slower component comprises subsoil processes like infiltration and interflow. Hence, the HyMOD uses a nonlinear tank connected to two tanks, each parameterizing the two processes of different rates. NAM ( Madsen 2000

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Christa D. Peters-Lidard
,
Faisal Hossain
,
L. Ruby Leung
,
Nate McDowell
,
Matthew Rodell
,
Francisco J. Tapiador
,
F. Joe Turk
, and
Andrew Wood

, and these maps continue to be periodically updated by the NWS (e.g., Bonnin et al. 2006 ). Fig . 25-1. Intensity–duration–frequency curve for Baltimore, Maryland, from TP-40 ( Hershfield 1961a ). [From Weather Bureau (1955); Source: NOAA/NWS.] The focus of this chapter is progress in hydrology for the last 100 years. As with any effort to track the progress of a field over a century, it is not quite possible to document all the advancements made across all subdisciplines. However, to make our

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Rolf H. Reichle
,
Randal D. Koster
,
Gabriëlle J. M. De Lannoy
,
Barton A. Forman
,
Qing Liu
,
Sarith P. P. Mahanama
, and
Ally Touré

similar efforts to improve global offline land surface simulations through corrected analysis or reanalysis forcing data (e.g., Dirmeyer and Tan 2001 ; Berg et al. 2005 ; Guo et al. 2006 ; Qian et al. 2006 ; Sheffield et al. 2006 ). Our paper focuses on the land surface hydrology estimates from MERRA and how they can be improved through simple corrections to land model parameters and the precipitation forcing. The paper is organized as follows. Section 2 briefly describes the MERRA modeling

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Xuejian Cao
,
Youcun Qi
, and
Guangheng Ni

directions rather than the direction determined by the building bottom elevation. Transforming initial spatial rainfall distribution on roofs into a new concentrated pattern at each building downspout is called building-induced rainfall redistribution (BIRR) herein. However, whether and how the BIRR influences urban hydrologic responses are still less understood. The current work aims to figure out the following issues: 1) whether the BIRR is negligible in urban hydrology; 2) if not, what the impact of

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Rolf H. Reichle
,
Clara S. Draper
,
Q. Liu
,
Manuela Girotto
,
Sarith P. P. Mahanama
,
Randal D. Koster
, and
Gabrielle J. M. De Lannoy

-generated precipitation is subject to significant errors in amounts and timing, which adversely impact the land surface hydrology estimates. To avoid this problem, the MERRA-2 model-generated precipitation is corrected with gauge- and satellite-based precipitation observations before reaching the surface. Observation-corrected precipitation was also used in MERRA-Land, an offline, land-only reanalysis product that supplements the original MERRA product ( Reichle 2012 ). Because of the precipitation corrections and

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Stefan Hagemann
,
Cui Chen
,
Jan O. Haerter
,
Jens Heinke
,
Dieter Gerten
, and
Claudio Piani

in situations where the hydrological climate change signal is unclear ( Mudelsee et al. 2003 ; Milly et al. 2002 ). Global climate models (GCMs) are used to investigate possible trends in the past and future global climate. To quantify details of projected changes in the hydrological cycle and their potential impacts on water resources, commonly used global hydrology models (GHMs) or land surface hydrology models (LSHMs) are forced with GCM output. These hydrological simulations largely depend

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Konstantinos M. Andreadis
,
Ding Liang
,
Leung Tsang
,
Dennis P. Lettenmaier
, and
Edward G. Josberger

variability of snow grain size with time and depth can have a large impact on the snowpack brightness temperatures ( Foster et al. 2005 ). Additionally, differences in the dielectric properties between liquid and frozen water lead to decreased volume scattering and amplified absorption, as the liquid water content of the snowpack increases. This means that meaningful derivation of snow parameters from passive microwave satellite observations for wet snowpacks is difficult. Land surface hydrology models

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Nevil Quinn
,
Günter Blöschl
,
András Bárdossy
,
Attilio Castellarin
,
Martyn Clark
,
Christophe Cudennec
,
Demetris Koutsoyiannis
,
Upmanu Lall
,
Lubomir Lichner
,
Juraj Parajka
,
Christa D. Peters-Lidard
,
Graham Sander
,
Hubert Savenije
,
Keith Smettem
,
Harry Vereecken
,
Alberto Viglione
,
Patrick Willems
,
Andy Wood
,
Ross Woods
,
Chong-Yu Xu
, and
Erwin Zehe

Over the past five years, the editors of a number of journals in the discipline of hydrology have met informally to discuss challenges and concerns in relation to the rapidly changing publishing landscape. Two of the previous meetings, in Götenborg in July 2013 and in Prague in June 2015, were followed by joint editorials ( Blöschl et al. 2014 ; Koutsoyiannis et al. 2016 ) published in all participating journals. A meeting was convened in Vienna in April 2017 [during the General Assembly of

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Long Yang
,
James Smith
,
Mary Lynn Baeck
,
Efrat Morin
, and
David C. Goodrich

1. Introduction Arid/semiarid regions, covering a large fraction of the global land area ( Zeng et al. 2008 ), are affected by high-impact flooding associated with infrequent extreme rainfall events (e.g., Schick 1988 ). The hydrology, hydrometeorology, and hydroclimatology of flooding in arid/semiarid regions are poorly understood (e.g., Higgins et al. 2003 ), and yet are of great societal importance. Our study focuses on the central Arizona region in the southwestern United States. Much of

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